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| author | Sergey Poznyakoff <gray@gnu.org> | 2019-06-07 08:00:32 +0300 |
|---|---|---|
| committer | Sergey Poznyakoff <gray@gnu.org> | 2019-06-07 08:00:32 +0300 |
| commit | c33922f128403f5d05d24f19abeaad2368ce5467 (patch) | |
| tree | 89ffecf0abbb4fedca962da0b79f0f850179e09f /doc | |
| parent | cc533e2c6b86b62db169f912b4e7891273061c77 (diff) | |
| download | pies-c33922f128403f5d05d24f19abeaad2368ce5467.tar.gz pies-c33922f128403f5d05d24f19abeaad2368ce5467.tar.bz2 | |
Implement additional env.eval statement
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/pies.texi | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/doc/pies.texi b/doc/pies.texi index 63064e5..4bd2f8f 100644 --- a/doc/pies.texi +++ b/doc/pies.texi @@ -1064,6 +1064,7 @@ env @{ clear; keep @var{pattern}; set "@var{name}=@var{value}"; + eval "@var{value}"; unset @var{pattern}; @} @end group @@ -1123,6 +1124,20 @@ env @{ @end example @end deffn +@deffn {env} eval "@var{value}" +Perform variable expansion on @var{value} and discard the result. This +is useful for side-effects. For example, to provide default value for +the @env{LD_LIBRARY_PATH} variable, one may write: + +@example +@group +env @{ + eval "$@{LD_LIBRARY_PATH:=/usr/local/lib@}"; +@} +@end group +@end example +@end deffn + @deffn {env} unset @var{pattern} Unset environment variables matching @var{pattern}. The following will unset the @env{LOGIN} variable: |