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(Limitations of Builtins): Describe "set -" problems.

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Paul Eggert 2005-04-29 22:05:14 +00:00
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doc/autoconf.texi
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@ -11180,9 +11180,14 @@ processing as soon as a non-option argument is found. Therefore, use
set x $my_list; shift
@end example
Some shells have the "opposite" problem of not recognizing all options
Avoid @samp{set -}, e.g., @samp{set - $my_list}. POSIX 1003.1-2001 no
longer requires support for this command, and in traditional shells
@samp{set - $my_list} resets the @samp{-v} and @samp{-x} options, which
makes scripts harder to debug.
Some nonstandard shells do not recognize more than one option
(e.g., @samp{set -e -x} assigns @samp{-x} to the command line). It is
better to elide these:
better to combine them:
@example
set -ex