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| author | Eric Blake <eblake@redhat.com> | 2010-10-20 16:56:40 -0600 |
|---|---|---|
| committer | Eric Blake <eblake@redhat.com> | 2010-10-20 17:01:19 -0600 |
| commit | b42491e3237735a9d31f6578ca4887f8be6b6742 (patch) | |
| tree | 878ff1264940ba050fc02bdbae7e9175cf62ea03 | |
| parent | c6b151d0e24f9670695ec6f3ef13f838ef9d05fc (diff) | |
| download | autoconf-b42491e3237735a9d31f6578ca4887f8be6b6742.tar.gz | |
docs: document dash bug in <>
* doc/autoconf.texi (File Descriptors): Dash 0.5.5 truncates on
<>; at least this was fixed in dash 0.5.6.
Signed-off-by: Eric Blake <eblake@redhat.com>
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | doc/autoconf.texi | 12 |
2 files changed, 18 insertions, 0 deletions
@@ -1,3 +1,9 @@ +2010-10-20 Eric Blake <eblake@redhat.com> + + docs: document dash bug in <> + * doc/autoconf.texi (File Descriptors): Dash 0.5.5 truncates on + <>; at least this was fixed in dash 0.5.6. + 2010-10-12 Ralf Wildenhues <Ralf.Wildenhues@gmx.de> tests: avoid AC_CACHE_CHECK test failure with dash. diff --git a/doc/autoconf.texi b/doc/autoconf.texi index b9570834..adbdded9 100644 --- a/doc/autoconf.texi +++ b/doc/autoconf.texi @@ -15060,6 +15060,18 @@ $ @kbd{echo hi >&5} bash: echo: write error: Communication error on send @end example +@noindent +Furthermore, versions of @command{dash} before 0.5.6 mistakenly truncate +regular files when using @samp{<>}: + +@example +$ @kbd{echo a > file} +$ @kbd{bash -c ': 1<>file'; cat file} +a +$ @kbd{dash -c ': 1<>file'; cat file} +$ rm a +@end example + When catering to old systems, don't redirect the same file descriptor several times, as you are doomed to failure under Ultrix. |