cc: [email protected]
Subject: Re: [ast-users] ksh exec'ing into last line of a script--different in
u & u+?
--------
> I have a script which, in its last line, calls another command. When I run it
> wi
> th ksh93u 2011-02-08 as its !#, the ksh process appears to exec into the
> command
> --it disappears from ps, the command appears with the PID the shell
> previously h
> ad, etc. With ksh93u+ 2012-08-01, this doesn't happen--the command appears as
> a
> child process of the shell script.
>
> While this is not necessarily a problem, I'd like to understand the new
> behavior
> . Is it expected? Are there any circumstances under which ksh93u+ will exec
> inst
> ead of fork/exec?
>
This is an optimization that the shell uses to save a fork() for better
performance.
There are a number of things that disable this optimization, for example
trap : EXIT
which sets an exit trap will prevent it.
David Korn
[email protected]
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