Correct, I use this frequently to drop out of subshells and functions.
Recent example (after rewriting my UWIN /etc/profile, to better
understand what's happening there):
function append_path {
nameref path=${1:?} || return
shift
typeset dir
for dir; do
[[ -d ${dir:?} ]] 2>& - || continue
path="${path:+$path:}$dir"
done
}
...
append_path PATH $(unixpath ${NTRESKIT:+"$NTRESKIT"} 2>& -)
append_path PATH /usr/X11/bin && export DISPLAY=localhost:0
append_path PATH /sys /win
...
The nameref and its argument have to succeed, so I let ${1:?} do the
work of complaining.
The || return will return the original value of $? to the caller.
Notes on this code sample:
1) I'm conveniently leaving out the reg search for the w2k reskit and
the msdev stuff here.
2) For interactive use, I've been using functions like 'use <arg>' and
'forget <arg>' that will
prepend or remove the first matching .../<arg>/bin to/from PATH for
common values of '...' (/usr, /opt).
I might post some of that on github.
Cheers,
Henk
On Mon, Apr 23, 2012, at 09:47 AM, Chet Ramey wrote:
> On 4/23/12 9:11 AM, ольга крыжановская wrote:
> > Clark, you must use exit $? and not exit without arguments.
>
> Why? The shell has never required that, and Posix makes it explicit.
>
> --
> ``The lyf so short, the craft so long to lerne.'' - Chaucer
> ``Ars longa, vita brevis'' - Hippocrates
> Chet Ramey, ITS, CWRU [email protected]
> http://cnswww.cns.cwru.edu/~chet/
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