From: "Bart Schaefer" <schaefer@candle.brasslantern.com>
To: "C. v. Stuckrad" <stucki@math.fu-berlin.de>, zsh-users@math.gatech.edu
Subject: Re: HOW TO distiguish between command input and forked subshell ?
Date: Mon, 16 Sep 1996 00:07:53 -0700 [thread overview]
Message-ID: <960916000753.ZM1100@candle.brasslantern.com> (raw)
In-Reply-To: "C. v. Stuckrad" <stucki@math.fu-berlin.de> "HOW TO distiguish between command input and forked subshell ?" (Sep 7, 6:30pm)
On Sep 7, 6:30pm, C. v. Stuckrad wrote:
} Subject: HOW TO distiguish between command input and forked subshell ?
}
} The User who aked was a typical beginner, who used a macro/function
} chpwd () { ...to change x-window-title to the current dir... }
} and now the title is no longer changed by cd-ing inside of $()
} expansions. BUT if you just type '(cd somwhere; do_something)'
} you again get the title changed to 'somewhere' instead of staying
} where the zsh stood and stayed !
Don't change the title bar in chpwd(). Change the title bar in precmd().
If you want to avoid changing it "too frequently" for some reason, use
if [[ ${oldPWD:=.} != $PWD ]]
then
# ... change title bar and ...
oldPWD=$PWD
fi
} Does somebody see a chance to distinguish the two cases ?
} I first thought $SHLVL, but it stays the same!
In older Bourne shells you used to be able to distinguish by using
foo=$$; (if [ $$ -ne $foo ] ... ; )
because $$ would change inside the subshell. But zsh doesn't do a new
getpid() for every $$ reference, so that doesn't work. (This causes
other problems, because you used to be able to have a subshell kill
itself with `kill -1 $$` but in zsh that kills the parent.)
I don't know of any way to detect subshell-ness, having played with
it a bit in the past.
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.nbn.com/people/lantern
New male in /home/schaefer:
>N 2 Justin William Schaefer Sat May 11 03:43 53/4040 "Happy Birthday"
prev parent reply other threads:[~1996-09-16 14:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <960905162314.ZM11373@admin.diego.netmanage.com>
1996-09-07 16:30 ` C. v. Stuckrad
1996-09-16 7:07 ` Bart Schaefer [this message]
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