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| author | Jim Meyering <jim@meyering.net> | 1997-06-12 16:32:08 +0000 |
|---|---|---|
| committer | Jim Meyering <jim@meyering.net> | 1997-06-12 16:32:08 +0000 |
| commit | a6062bfb0566cdb406c82c1dda8a3a1a59a9fd9c (patch) | |
| tree | 377e5407bd0cd02874e417ce8f19893240bf030e | |
| parent | 83461932b5f9c189f5a618e7de63c05c6027db29 (diff) | |
| download | coreutils-a6062bfb0566cdb406c82c1dda8a3a1a59a9fd9c.tar.xz | |
document expr's new quote operator
| -rw-r--r-- | doc/sh-utils.texi | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/doc/sh-utils.texi b/doc/sh-utils.texi index b72576954..fe0df2c06 100644 --- a/doc/sh-utils.texi +++ b/doc/sh-utils.texi @@ -721,7 +721,7 @@ Exit status: @menu * Relations for expr:: | & < <= = == != >= > * Numeric expressions:: + - * / % -* String expressions:: <colon> match substr index length +* String expressions:: <colon> match substr index length quote * Examples of expr:: Examples. @end menu @@ -854,6 +854,16 @@ Returns the first position in @var{string} where the first character in @findex length Returns the length of @var{string}. +@item quote @var{token} +@findex quote +Interpret @var{token} as a string, even if it is a keyword like @var{match} +or an operator like @code{/}. +This makes it possible to test @code{expr length quote "$x"} or +@code{expr quote "$x" : '.*/\(.\)'} and have it do the right thing even if +the value of @var{$x} happens to be @code{/} or @code{index}. +This operator is provided as a GNU extension. It is disabled when +the environment variable, @var{POSIXLY_CORRECT} is set. + @end table The keywords cannot be used as strings. |