maint: update all copyright year number ranges

Run "make update-copyright" and then...
* gnulib: Update to latest with copyright year adjusted.
* tests/init.sh: Sync with gnulib to pick up copyright year.
* bootstrap: Likewise.

69 files changed, 87 insertions, 71 deletions

diff --git a/ChangeLog-2007 b/ChangeLog-2007
index 0c9d43f..d3c3744 100644
--- a/ChangeLog-2007
+++ b/ChangeLog-2007
@@ -1776,7 +1776,7 @@ Sat Oct 31 12:46:00 1992  Jean-loup Gailly  (jloup@chorus.fr)
 
 	-----
 
-	Copyright (C) 1997-2002, 2006-2020 Free Software Foundation, Inc.
+	Copyright (C) 1997-2002, 2006-2021 Free Software Foundation, Inc.
 	Copyright (C) 1992, 1993 Jean-loup Gailly
 
 	Copying and distribution of this file, with or without
diff --git a/Makefile.am b/Makefile.am
index d30c00e..cd79331 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 # Make gzip (GNU zip).
 
-# Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2020 Free Software Foundation,
+# Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2021 Free Software Foundation,
 # Inc.
 
 # This program is free software; you can redistribute it and/or modify
diff --git a/NEWS b/NEWS
index 4d84190..2f258df 100644
--- a/NEWS
+++ b/NEWS
@@ -545,7 +545,7 @@ Major changes form 0.5 to 0.6:
 
 ========================================================================
 
-Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2020 Free Software Foundation,
+Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2021 Free Software Foundation,
 Inc.
 Copyright (C) 1992, 1993 Jean-loup Gailly
 
diff --git a/README b/README
index 9464e9c..372e3b4 100644
--- a/README
+++ b/README
@@ -115,7 +115,7 @@ note that the range specifies every single year in that closed interval.
 
 ========================================================================
 
-Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2020 Free Software Foundation,
+Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2021 Free Software Foundation,
 Inc.
 Copyright (C) 1992, 1993 Jean-loup Gailly
 
diff --git a/README-hacking b/README-hacking
index 4b9285a..0efda0d 100644
--- a/README-hacking
+++ b/README-hacking
@@ -45,7 +45,7 @@ Enjoy!
 
 -----
 
-Copyright (C) 2002-2006, 2009-2020 Free Software Foundation, Inc.
+Copyright (C) 2002-2006, 2009-2021 Free Software Foundation, Inc.
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
diff --git a/TODO b/TODO
index bf48a34..cd16b86 100644
--- a/TODO
+++ b/TODO
@@ -69,7 +69,7 @@ Send comments to <bug-gzip@gnu.org>.
 
 ========================================================================
 
-Copyright (C) 1999, 2001, 2006, 2009-2020 Free Software Foundation, Inc.
+Copyright (C) 1999, 2001, 2006, 2009-2021 Free Software Foundation, Inc.
 Copyright (C) 1992, 1993 Jean-loup Gailly
 
 Permission is granted to copy, distribute and/or modify this document
diff --git a/bits.c b/bits.c
index 5b697d6..42ea2b0 100644
--- a/bits.c
+++ b/bits.c
@@ -1,6 +1,6 @@
 /* bits.c -- output variable-length bit strings
 
-   Copyright (C) 1999, 2009-2020 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2009-2021 Free Software Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
    This program is free software; you can redistribute it and/or modify
diff --git a/bootstrap b/bootstrap
index 70fd73c..7523f65 100755
--- a/bootstrap
+++ b/bootstrap
@@ -1,10 +1,10 @@
 #! /bin/sh
 # Print a version string.
-scriptversion=2019-01-04.17; # UTC
+scriptversion=2020-11-18.17; # UTC
 
 # Bootstrap this package from checked-out sources.
 
-# Copyright (C) 2003-2020 Free Software Foundation, Inc.
+# Copyright (C) 2003-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -71,7 +71,9 @@ Options:
  --no-git                 do not use git to update gnulib.  Requires that
                           --gnulib-srcdir point to a correct gnulib snapshot
  --skip-po                do not download po files
-
+EOF
+  bootstrap_print_option_usage_hook
+  cat <<EOF
 If the file $me.conf exists in the same directory as this script, its
 contents are read as shell variables to configure the bootstrap.
 
@@ -154,6 +156,18 @@ gnulib_files=
 : ${AUTOPOINT=autopoint}
 : ${AUTORECONF=autoreconf}
 
+# A function to be called for each unrecognized option.  Returns 0 if
+# the option in $1 has been processed by the function.  Returns 1 if
+# the option has not been processed by the function.  Override it via
+# your own definition in bootstrap.conf
+
+bootstrap_option_hook() { return 1; }
+
+# A function to be called in order to print the --help information
+# corresponding to user-defined command-line options.
+
+bootstrap_print_option_usage_hook() { :; }
+
 # A function to be called right after gnulib-tool is run.
 # Override it via your own definition in bootstrap.conf.
 bootstrap_post_import_hook() { :; }
@@ -335,7 +349,7 @@ do
   --no-git)
     use_git=false;;
   *)
-    die "$option: unknown option";;
+    bootstrap_option_hook $option || die "$option: unknown option";;
   esac
 done
 
@@ -970,7 +984,7 @@ bootstrap_post_import_hook \
 # Uninitialized submodules are listed with an initial dash.
 if $use_git && git submodule | grep '^-' >/dev/null; then
   die "some git submodules are not initialized. "     \
-      "Run 'git submodule init' and bootstrap again."
+      "Run 'git submodule update --init' and bootstrap again."
 fi
 
 # Remove any dangling symlink matching "*.m4" or "*.[ch]" in some
diff --git a/bootstrap.conf b/bootstrap.conf
index af73bd3..1f9fe55 100644
--- a/bootstrap.conf
+++ b/bootstrap.conf
@@ -1,6 +1,6 @@
 # Bootstrap configuration.
 
-# Copyright (C) 2006-2007, 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 2006-2007, 2009-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/cfg.mk b/cfg.mk
index aa1c619..afb2769 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -1,5 +1,5 @@
 # Customize maint.mk                           -*- makefile -*-
-# Copyright (C) 2003-2020 Free Software Foundation, Inc.
+# Copyright (C) 2003-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/configure.ac b/configure.ac
index 40ab025..25de62c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 # Configure template for gzip.
 
-# Copyright (C) 1999-2002, 2006-2007, 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 1999-2002, 2006-2007, 2009-2021 Free Software Foundation, Inc.
 
 # Copyright (C) 1992-1993 Jean-loup Gailly
 
diff --git a/deflate.c b/deflate.c
index 5ed2a9b..55bdc0e 100644
--- a/deflate.c
+++ b/deflate.c
@@ -1,6 +1,6 @@
 /* deflate.c -- compress data using the deflation algorithm
 
-   Copyright (C) 1999, 2006, 2009-2020 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2006, 2009-2021 Free Software Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
    This program is free software; you can redistribute it and/or modify
diff --git a/dfltcc.c b/dfltcc.c
index 3a5b92d..d0b6503 100644
--- a/dfltcc.c
+++ b/dfltcc.c
@@ -1,6 +1,6 @@
 /* dfltcc.c -- compress data using IBM Z DEFLATE COMPRESSION CALL
 
-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
diff --git a/doc/Makefile.am b/doc/Makefile.am
index cdc5b27..e1cfb18 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -1,6 +1,6 @@
 # Make gzip documentation.				-*-Makefile-*-
 
-# Copyright (C) 2006, 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 2006, 2009-2021 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/doc/gzip.texi b/doc/gzip.texi
index 76e76c6..abceb58 100644
--- a/doc/gzip.texi
+++ b/doc/gzip.texi
@@ -12,7 +12,7 @@ This manual is for GNU Gzip
 (version @value{VERSION}, @value{UPDATED}),
 and documents commands for compressing and decompressing data.
 
-Copyright @copyright{} 1998--1999, 2001--2002, 2006--2007, 2009--2020 Free
+Copyright @copyright{} 1998--1999, 2001--2002, 2006--2007, 2009--2021 Free
 Software Foundation, Inc.
 
 Copyright @copyright{} 1992, 1993 Jean-loup Gailly
diff --git a/gnulib b/gnulib
-Subproject 658d3920dd6d1e41efe8d1f3b7e22a356e3d709
+Subproject bb6ecf3278cce40cfa6be693697e7995dca1a03
diff --git a/gunzip.in b/gunzip.in
index a2a00c0..2f1f4b8 100644
--- a/gunzip.in
+++ b/gunzip.in
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Uncompress files.  This is the inverse of gzip.
 
-# Copyright (C) 2007, 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007, 2010-2021 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/gzexe.in b/gzexe.in
index eeaf4d4..e78385c 100644
--- a/gzexe.in
+++ b/gzexe.in
@@ -13,7 +13,7 @@
 # On Ultrix, /bin/sh is too buggy, change the first line to: #!/bin/sh5
 
 
-# Copyright (C) 1998, 2002, 2004, 2006-2007, 2010-2020 Free Software
+# Copyright (C) 1998, 2002, 2004, 2006-2007, 2010-2021 Free Software
 # Foundation, Inc.
 # Copyright (C) 1993 Jean-loup Gailly
 
diff --git a/gzip.1 b/gzip.1
index 0029934..a87050d 100644
--- a/gzip.1
+++ b/gzip.1
@@ -515,7 +515,7 @@ GNU gzip home page: <https://www.gnu.org/software/gzip/>
 .br
 General help using GNU software: <https://www.gnu.org/gethelp/>
 .SH "COPYRIGHT NOTICE"
-Copyright \(co 1998-1999, 2001-2002, 2012, 2015-2020 Free Software Foundation,
+Copyright \(co 1998-1999, 2001-2002, 2012, 2015-2021 Free Software Foundation,
 Inc.
 .br
 Copyright \(co 1992, 1993 Jean-loup Gailly
diff --git a/gzip.c b/gzip.c
index e1aaf4e..d778641 100644
--- a/gzip.c
+++ b/gzip.c
@@ -1,6 +1,6 @@
 /* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
 
-   Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2020 Free Software
+   Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2021 Free Software
    Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
diff --git a/gzip.h b/gzip.h
index 9e5528d..7c0acd4 100644
--- a/gzip.h
+++ b/gzip.h
@@ -1,6 +1,6 @@
 /* gzip.h -- common declarations for all gzip modules
 
-   Copyright (C) 1997-1999, 2001, 2006-2007, 2009-2020 Free Software
+   Copyright (C) 1997-1999, 2001, 2006-2007, 2009-2021 Free Software
    Foundation, Inc.
 
    Copyright (C) 1992-1993 Jean-loup Gailly.
diff --git a/inflate.c b/inflate.c
index b79f5cb..45538d2 100644
--- a/inflate.c
+++ b/inflate.c
@@ -1,6 +1,6 @@
 /* Inflate deflated data
 
-   Copyright (C) 1997-1999, 2002, 2006, 2009-2020 Free Software Foundation,
+   Copyright (C) 1997-1999, 2002, 2006, 2009-2021 Free Software Foundation,
    Inc.
 
    This program is free software; you can redistribute it and/or modify
diff --git a/lib/.gitignore b/lib/.gitignore
index d416fe7..c0a87fb 100644
--- a/lib/.gitignore
+++ b/lib/.gitignore
@@ -241,3 +241,4 @@
 /arg-nonnull.h
 /c++defs.h
 /warn-on-use.h
+/pipe.c
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 46d532c..12e99b0 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -1,6 +1,6 @@
 # Make gzip/lib				-*-Makefile-*-
 
-# Copyright (C) 2006, 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 2006, 2009-2021 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/lib/match.c b/lib/match.c
index 2ebc97d..c42aa4d 100644
--- a/lib/match.c
+++ b/lib/match.c
@@ -1,6 +1,6 @@
 /* match.s -- optional optimized asm version of longest match in deflate.c
 
-   Copyright (C) 2002, 2006, 2009-2020 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2006, 2009-2021 Free Software Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
    This program is free software; you can redistribute it and/or modify
diff --git a/lzw.h b/lzw.h
index 2d9b4da..656fd1e 100644
--- a/lzw.h
+++ b/lzw.h
@@ -1,6 +1,6 @@
 /* lzw.h -- define the lzw functions.
 
-   Copyright (C) 1994-2020 Free Software Foundation, Inc.
+   Copyright (C) 1994-2021 Free Software Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly.
 
    This program is free software; you can redistribute it and/or modify
diff --git a/m4/.gitignore b/m4/.gitignore
index 640ddd3..6d2a652 100644
--- a/m4/.gitignore
+++ b/m4/.gitignore
@@ -159,3 +159,4 @@
 /inttypes.m4
 /open-slash.m4
 /zzgnulib.m4
+/pipe.m4
diff --git a/m4/shell.m4 b/m4/shell.m4
index 67a4b3b..30c7670 100644
--- a/m4/shell.m4
+++ b/m4/shell.m4
@@ -1,6 +1,6 @@
 # Check for a working shell.
 
-# Copyright (C) 2000-2001, 2007, 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 2000-2001, 2007, 2009-2021 Free Software Foundation, Inc.
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation; either version 3, or (at your option)
diff --git a/revision.h b/revision.h
index a03c7fe..5ca5e4a 100644
--- a/revision.h
+++ b/revision.h
@@ -1,6 +1,6 @@
 /* revision.h -- define the version number
 
-   Copyright (C) 1998-1999, 2001-2002, 2006, 2009-2020 Free Software
+   Copyright (C) 1998-1999, 2001-2002, 2006, 2009-2021 Free Software
    Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly.
 
diff --git a/tailor.h b/tailor.h
index b431d64..5a03f7a 100644
--- a/tailor.h
+++ b/tailor.h
@@ -1,6 +1,6 @@
 /* tailor.h -- target dependent definitions
 
-   Copyright (C) 1997-1999, 2002, 2006, 2009-2020 Free Software Foundation,
+   Copyright (C) 1997-1999, 2002, 2006, 2009-2021 Free Software Foundation,
    Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 2f7c9c3..256bbf7 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,5 +1,5 @@
 ## Process this file with automake to create Makefile.in
-# Copyright 2010-2020 Free Software Foundation, Inc.
+# Copyright 2010-2021 Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/gzip-env b/tests/gzip-env
index 2ad311e..daadb80 100755
--- a/tests/gzip-env
+++ b/tests/gzip-env
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Test the obsolescent GZIP environment variable.
 
-# Copyright 2015-2020 Free Software Foundation, Inc.
+# Copyright 2015-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/helin-segv b/tests/helin-segv
index 97e0dfa..6e87c77 100755
--- a/tests/helin-segv
+++ b/tests/helin-segv
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Before gzip-1.4, gzip -d would segfault on some inputs.
 
-# Copyright (C) 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2010-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/help-version b/tests/help-version
index 91aa42b..3ad0d8d 100755
--- a/tests/help-version
+++ b/tests/help-version
@@ -2,7 +2,7 @@
 # Make sure all these programs work properly
 # when invoked with --help or --version.
 
-# Copyright (C) 2000-2020 Free Software Foundation, Inc.
+# Copyright (C) 2000-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/hufts b/tests/hufts
index 1b8ab3b..ec84540 100755
--- a/tests/hufts
+++ b/tests/hufts
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Exercise bugs whereby invalid input could make gzip -d misbehave.
 
-# Copyright (C) 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/init.sh b/tests/init.sh
index b4a5944..9ef8348 100644
--- a/tests/init.sh
+++ b/tests/init.sh
@@ -1,6 +1,6 @@
 # source this file; set up for tests
 
-# Copyright (C) 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -389,7 +389,7 @@ setup_ ()
   if test "$VERBOSE" = yes; then
     # Test whether set -x may cause the selected shell to corrupt an
     # application's stderr.  Many do, including zsh-4.3.10 and the /bin/sh
-    # from SunOS 5.11, OpenBSD 4.7 and Irix 5.x and 6.5.
+    # from SunOS 5.11, OpenBSD 4.7 and Irix 6.5.
     # If enabling verbose output this way would cause trouble, simply
     # issue a warning and refrain.
     if $gl_set_x_corrupts_stderr_; then
diff --git a/tests/keep b/tests/keep
index 4c09091..c60eb1a 100755
--- a/tests/keep
+++ b/tests/keep
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Exercise the --keep option.
 
-# Copyright (C) 2013-2020 Free Software Foundation, Inc.
+# Copyright (C) 2013-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/list b/tests/list
index 5c310be..6f9e570 100755
--- a/tests/list
+++ b/tests/list
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Exercise the --list option.
 
-# Copyright 2016-2020 Free Software Foundation, Inc.
+# Copyright 2016-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/memcpy-abuse b/tests/memcpy-abuse
index 9fc76db..afd7192 100755
--- a/tests/memcpy-abuse
+++ b/tests/memcpy-abuse
@@ -2,7 +2,7 @@
 # Before gzip-1.4, this the use of memcpy in inflate_codes could
 # mistakenly operate on overlapping regions.  Exercise that code.
 
-# Copyright (C) 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2010-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/mixed b/tests/mixed
index b851ef3..c3579ef 100755
--- a/tests/mixed
+++ b/tests/mixed
@@ -2,7 +2,7 @@
 # Ensure that gzip -cdf handles mixed compressed/not-compressed data
 # Before gzip-1.5, it would produce invalid output.
 
-# Copyright (C) 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2010-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/null-suffix-clobber b/tests/null-suffix-clobber
index 87cc37a..3a11876 100755
--- a/tests/null-suffix-clobber
+++ b/tests/null-suffix-clobber
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Before gzip-1.5, gzip -d -S '' k.gz would delete F.gz and not create "F"
 
-# Copyright (C) 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2010-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/reproducible b/tests/reproducible
index e06f5ef..81e7e76 100755
--- a/tests/reproducible
+++ b/tests/reproducible
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Ensure that gzip has repoducible output.
 
-# Copyright 2018-2020 Free Software Foundation, Inc.
+# Copyright 2018-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/stdin b/tests/stdin
index 7bce33c..8d7dee6 100755
--- a/tests/stdin
+++ b/tests/stdin
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Ensure that gzip interprets "-" as stdin.
 
-# Copyright (C) 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/timestamp b/tests/timestamp
index 53e21c4..d914b6a 100755
--- a/tests/timestamp
+++ b/tests/timestamp
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Exercise timestamps.
 
-# Copyright 2016-2020 Free Software Foundation, Inc.
+# Copyright 2016-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/trailing-nul b/tests/trailing-nul
index 3cc5a6e..a2e6c35 100755
--- a/tests/trailing-nul
+++ b/tests/trailing-nul
@@ -2,7 +2,7 @@
 # gzip accepts trailing NUL bytes; don't fail if there is exactly one.
 # Before gzip-1.4, this would fail.
 
-# Copyright (C) 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/two-files b/tests/two-files
index efdfb4f..3ad25c8 100755
--- a/tests/two-files
+++ b/tests/two-files
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Ensure that gzip can compress more than one file.
 
-# Copyright 2020 Free Software Foundation, Inc.
+# Copyright 2020-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/unpack-invalid b/tests/unpack-invalid
index 95acd0a..688ceb3 100755
--- a/tests/unpack-invalid
+++ b/tests/unpack-invalid
@@ -2,7 +2,7 @@
 # gzip should report invalid 'unpack' input when uncompressing.
 # With gzip-1.5, it would output invalid data instead.
 
-# Copyright (C) 2012-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/unpack-valid b/tests/unpack-valid
index 96f8d81..97a8717 100755
--- a/tests/unpack-valid
+++ b/tests/unpack-valid
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Test end-of-block check in unpack code
 
-# Copyright 2017-2020 Free Software Foundation, Inc.
+# Copyright 2017-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/upper-suffix b/tests/upper-suffix
index 37d90a4..62bb460 100755
--- a/tests/upper-suffix
+++ b/tests/upper-suffix
@@ -2,7 +2,7 @@
 # Ensure an upper-case user-specified suffix works as expected.
 # This test would have failed in gzip-1.18
 
-# Copyright 2017-2020 Free Software Foundation, Inc.
+# Copyright 2017-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/z-suffix b/tests/z-suffix
index f23512a..fb1ee0e 100755
--- a/tests/z-suffix
+++ b/tests/z-suffix
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Check that -Sz works.
 
-# Copyright 2014-2020 Free Software Foundation, Inc.
+# Copyright 2014-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/zdiff b/tests/zdiff
index 8c6cde7..da72fc7 100755
--- a/tests/zdiff
+++ b/tests/zdiff
@@ -2,7 +2,7 @@
 # Exercise zdiff with two compressed inputs.
 # Before gzip-1.4, this would fail.
 
-# Copyright (C) 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/zgrep-context b/tests/zgrep-context
index e89d0ca..4138d06 100755
--- a/tests/zgrep-context
+++ b/tests/zgrep-context
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Ensure that zgrep -15 works.  Before gzip-1.5, it would fail.
 
-# Copyright (C) 2012-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/zgrep-f b/tests/zgrep-f
index fdf1609..9806aaa 100755
--- a/tests/zgrep-f
+++ b/tests/zgrep-f
@@ -2,7 +2,7 @@
 # Ensure that zgrep -f - works like grep -f -
 # Before gzip-1.4, it would fail.
 
-# Copyright (C) 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 2009-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/zgrep-signal b/tests/zgrep-signal
index a7a730d..a2e0c08 100755
--- a/tests/zgrep-signal
+++ b/tests/zgrep-signal
@@ -2,7 +2,7 @@
 # Check that zgrep is terminated gracefully by signal when
 # its grep/sed pipeline is terminated by a signal.
 
-# Copyright (C) 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2010-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/tests/znew-k b/tests/znew-k
index b375267..45fa77a 100755
--- a/tests/znew-k
+++ b/tests/znew-k
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Check that znew -K works without compress(1).
 
-# Copyright (C) 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2010-2021 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/trees.c b/trees.c
index d774dc3..7fa177d 100644
--- a/trees.c
+++ b/trees.c
@@ -1,6 +1,6 @@
 /* trees.c -- output deflated data using Huffman coding
 
-   Copyright (C) 1997-1999, 2009-2020 Free Software Foundation, Inc.
+   Copyright (C) 1997-1999, 2009-2021 Free Software Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
    This program is free software; you can redistribute it and/or modify
diff --git a/unpack.c b/unpack.c
index 222b2dc..1828b83 100644
--- a/unpack.c
+++ b/unpack.c
@@ -1,6 +1,6 @@
 /* unpack.c -- decompress files in pack format.
 
-   Copyright (C) 1997, 1999, 2006, 2009-2020 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1999, 2006, 2009-2021 Free Software Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
    This program is free software; you can redistribute it and/or modify
diff --git a/unzip.c b/unzip.c
index 07a5a84..dacfbaf 100644
--- a/unzip.c
+++ b/unzip.c
@@ -1,6 +1,6 @@
 /* unzip.c -- decompress files in gzip or pkzip format.
 
-   Copyright (C) 1997-1999, 2009-2020 Free Software Foundation, Inc.
+   Copyright (C) 1997-1999, 2009-2021 Free Software Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
    This program is free software; you can redistribute it and/or modify
diff --git a/util.c b/util.c
index 79fe505..e4240a7 100644
--- a/util.c
+++ b/util.c
@@ -1,6 +1,6 @@
 /* util.c -- utility functions for gzip support
 
-   Copyright (C) 1997-1999, 2001-2002, 2006, 2009-2020 Free Software
+   Copyright (C) 1997-1999, 2001-2002, 2006, 2009-2021 Free Software
    Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
diff --git a/zcat.in b/zcat.in
index 2920249..f47e48f 100644
--- a/zcat.in
+++ b/zcat.in
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Uncompress files to standard output.
 
-# Copyright (C) 2007, 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007, 2010-2021 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/zcmp.in b/zcmp.in
index e4313f4..e902120 100644
--- a/zcmp.in
+++ b/zcmp.in
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Compare the uncompressed contents of compressed files, byte by byte.
 
-# Copyright (C) 2007, 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007, 2010-2021 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/zdiff.in b/zdiff.in
index d9c5929..a1325f2 100644
--- a/zdiff.in
+++ b/zdiff.in
@@ -1,7 +1,7 @@
 #!/bin/sh
 # sh is buggy on RS/6000 AIX 3.2. Replace above line with #!/bin/ksh
 
-# Copyright (C) 1998, 2002, 2006-2007, 2009-2020 Free Software Foundation, Inc.
+# Copyright (C) 1998, 2002, 2006-2007, 2009-2021 Free Software Foundation, Inc.
 # Copyright (C) 1993 Jean-loup Gailly
 
 # This program is free software; you can redistribute it and/or modify
diff --git a/zforce.in b/zforce.in
index 0435ccb..9edf68e 100644
--- a/zforce.in
+++ b/zforce.in
@@ -6,7 +6,7 @@
 # 12345678901234 is renamed to 12345678901.gz
 
 
-# Copyright (C) 2002, 2007, 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2007, 2010-2021 Free Software Foundation, Inc.
 # Copyright (C) 1993 Jean-loup Gailly
 
 # This program is free software; you can redistribute it and/or modify
diff --git a/zgrep.in b/zgrep.in
index 16b86c2..ac1e122 100644
--- a/zgrep.in
+++ b/zgrep.in
@@ -3,7 +3,7 @@
 # zgrep -- a wrapper around a grep program that decompresses files as needed
 # Adapted from a version sent by Charles Levert <charles@comm.polymtl.ca>
 
-# Copyright (C) 1998, 2001-2002, 2006-2007, 2009-2020 Free Software Foundation,
+# Copyright (C) 1998, 2001-2002, 2006-2007, 2009-2021 Free Software Foundation,
 # Inc.
 
 # Copyright (C) 1993 Jean-loup Gailly
diff --git a/zip.c b/zip.c
index b2201a3..4798d11 100644
--- a/zip.c
+++ b/zip.c
@@ -1,6 +1,6 @@
 /* zip.c -- compress files to the gzip or pkzip format
 
-   Copyright (C) 1997-1999, 2006-2007, 2009-2020 Free Software Foundation, Inc.
+   Copyright (C) 1997-1999, 2006-2007, 2009-2021 Free Software Foundation, Inc.
    Copyright (C) 1992-1993 Jean-loup Gailly
 
    This program is free software; you can redistribute it and/or modify
diff --git a/zless.1 b/zless.1
index d41c0c3..84c6cac 100644
--- a/zless.1
+++ b/zless.1
@@ -32,7 +32,7 @@ To read compressed data from a pipe, you can use
 instead of
 .RB ".\|.\|." "|zless" .
 .SH "COPYRIGHT NOTICE"
-Copyright \(co 2006-2007, 2015-2020 Free Software Foundation, Inc.
+Copyright \(co 2006-2007, 2015-2021 Free Software Foundation, Inc.
 .br
 Copyright \(co 1992, 1993 Jean-loup Gailly
 .PP
diff --git a/zless.in b/zless.in
index 0c2173c..04619c3 100644
--- a/zless.in
+++ b/zless.in
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-# Copyright (C) 1998, 2002, 2006-2007, 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 1998, 2002, 2006-2007, 2010-2021 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
diff --git a/zmore.in b/zmore.in
index 151778e..eb17965 100644
--- a/zmore.in
+++ b/zmore.in
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-# Copyright (C) 2001-2002, 2007, 2010-2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2002, 2007, 2010-2021 Free Software Foundation, Inc.
 # Copyright (C) 1992, 1993 Jean-loup Gailly
 
 # This program is free software; you can redistribute it and/or modify
diff --git a/znew.in b/znew.in
index df3f05b..56c2d60 100644
--- a/znew.in
+++ b/znew.in
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-# Copyright (C) 1998, 2002, 2004, 2007, 2010-2020 Free Software Foundation,
+# Copyright (C) 1998, 2002, 2004, 2007, 2010-2021 Free Software Foundation,
 # Inc.
 # Copyright (C) 1993 Jean-loup Gailly