diff options
Diffstat (limited to 'doc/bashref.texi')
| -rw-r--r-- | doc/bashref.texi | 39 |
1 files changed, 28 insertions, 11 deletions
diff --git a/doc/bashref.texi b/doc/bashref.texi index 05193c5b..e679425b 100644 --- a/doc/bashref.texi +++ b/doc/bashref.texi @@ -621,11 +621,11 @@ That is, each command reads the previous command's output. This connection is performed before any redirections specified by the command. -If @samp{|&} is used, @var{command1}'s standard output and standard error -are connected to +If @samp{|&} is used, @var{command1}'s standard error, in addition to +its standard output, is connected to @var{command2}'s standard input through the pipe; it is shorthand for @code{2>&1 |}. -This implicit redirection of the standard error is +This implicit redirection of the standard error to the standard output is performed after any redirections specified by the command. The reserved word @code{time} causes timing statistics @@ -2216,8 +2216,9 @@ $(( @var{expression} )) The expression is treated as if it were within double quotes, but a double quote inside the parentheses is not treated specially. -All tokens in the expression undergo parameter expansion, command -substitution, and quote removal. +All tokens in the expression undergo parameter and variable expansion, +command substitution, and quote removal. +The result is treated as the arithmetic expression to be evaluated. Arithmetic expansions may be nested. The evaluation is performed according to the rules listed below @@ -3899,8 +3900,8 @@ are given, then display the values of variables instead. The @option{-p} option will display the attributes and values of each @var{name}. -When @option{-p} is used with @var{name} arguments, additional options -are ignored. +When @option{-p} is used with @var{name} arguments, additional options, +other than @option{-f} and @option{-F}, are ignored. When @option{-p} is supplied without @var{name} arguments, @code{declare} will display the attributes and values of all variables having the @@ -4824,7 +4825,10 @@ This builtin allows you to change additional shell optional behavior. shopt [-pqsu] [-o] [@var{optname} @dots{}] @end example -Toggle the values of variables controlling optional shell behavior. +Toggle the values of settings controlling optional shell behavior. +The settings can be either those listed below, or, if the +@option{-o} option is used, those available with the @option{-o} +option to the @code{set} builtin command (@pxref{The Set Builtin}). With no options, or with the @option{-p} option, a list of all settable options is displayed, with an indication of whether or not each is set. The @option{-p} option causes output to be displayed in a form that @@ -5045,7 +5049,8 @@ the ignored words are the only possible completions. This option is enabled by default. @item globasciiranges -If set, range expressions used in pattern matching (@pxref{Pattern Matching}) +If set, range expressions used in pattern matching bracket expressions +(@pxref{Pattern Matching}) behave as if in the traditional C locale when performing comparisons. That is, the current locale's collating sequence is not taken into account, so @@ -6224,8 +6229,8 @@ file exists and is readable. It will not do this if invoked as @code{sh}. The @option{--norc} option may be used to inhibit this behavior, and the @option{--rcfile} option may be used to force another file to be read, but -@code{rshd} does not generally invoke the shell with those options or -allow them to be specified. +neither @code{rshd} nor @code{sshd} generally invoke the shell with those +options or allow them to be specified. @subsubheading Invoked with unequal effective and real @sc{uid/gid}s @@ -6813,6 +6818,12 @@ and an index of -1 refers to the last element. An array variable is considered set if a subscript has been assigned a value. The null string is a valid value. +It is possible to obtain the keys (indices) of an array as well as the values. +$@{!@var{name}[@@]@} and $@{!@var{name}[*]@} expand to the indices +assigned in array variable @var{name}. +The treatment when in double quotes is similar to the expansion of the +special parameters @samp{@@} and @samp{*} within double quotes. + The @code{unset} builtin is used to destroy arrays. @code{unset @var{name}[@var{subscript}]} destroys the array element at index @var{subscript}. @@ -8069,6 +8080,12 @@ above under @ref{Pattern Matching}. Set the default value of the @var{extglob} shell option described above under @ref{The Shopt Builtin} to be enabled. +@item --enable-glob-asciirange-default +Set the default value of the @var{globasciiranges} shell option described +above under @ref{The Shopt Builtin} to be enabled. +This controls the behavior of character ranges when used in pattern matching +bracket expressions. + @item --enable-help-builtin Include the @code{help} builtin, which displays help on shell builtins and variables (@pxref{Bash Builtins}). |