/[autoconf]/autoconf/doc/autoconf.texi
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revision 1.657 by eggert, Sun Sep 1 08:24:41 2002 UTC revision 1.658 by eggert, Sun Sep 1 08:36:52 2002 UTC
# Line 9133  your script might be suspended waiting f Line 9133  your script might be suspended waiting f
9133  @evindex PS2  @evindex PS2
9134  @evindex PS4  @evindex PS4
9135  These variables should not matter for shell scripts, since they are  These variables should not matter for shell scripts, since they are
9136  supposed affect only interactive shells.  However, at least one shell  supposed to affect only interactive shells.  However, at least one
9137  (the pre-3.0 UWIN @command{ksh}) gets confused about whether it is  shell (the pre-3.0 @sc{uwin} @command{ksh}) gets confused about
9138  interactive, which means that (for example) a @env{PS1} with a side  whether it is interactive, which means that (for example) a @env{PS1}
9139  effect can unexpectedly modify @samp{$?}.  To work around this bug,  with a side effect can unexpectedly modify @samp{$?}.  To work around
9140  Autoconf-generated scripts do something like this:  this bug, Autoconf-generated scripts do something like this:
9141    
9142  @example  @example
9143  (unset ENV) >/dev/null 2>&1 && unset ENV MAIL MAILPATH  (unset ENV) >/dev/null 2>&1 && unset ENV MAIL MAILPATH

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