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Diffstat (limited to 'doc/grep.texi')
| -rw-r--r-- | doc/grep.texi | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/grep.texi b/doc/grep.texi index e05ae257..ce6d6dc0 100644 --- a/doc/grep.texi +++ b/doc/grep.texi @@ -202,6 +202,7 @@ in a shell command. Obtain patterns from @var{file}, one per line. If this option is used multiple times or is combined with the @option{-e} (@option{--regexp}) option, search for all patterns given. +When @var{file} is @samp{-}, read patterns from standard input. The empty file contains zero patterns, and therefore matches nothing. (@option{-f} is specified by POSIX.) |