From: "Paul D. Swasey" <ps3u+@andrew.cmu.edu>
To: rc@archone.tamu.edu
Subject: 'cd -'
Date: Tue, 17 Dec 1991 02:15:24 -0600 [thread overview]
Message-ID: <Added.EdHP_JC00UkT8Csk4V@andrew.cmu.edu> (raw)
Here is a simple way to get the effect of kshes 'cd -', it costs an
extra line per cd command in your $history but it only costs one
variable (the current directory cache) and one call to "pwd", when
leaving the current directory (if the current directory is not $home).
(it's nice for me because I do "pwd" a lot, anyway, so "cd" only has
to calculate the current directory about half the time...)
sample:
peso ; pwd
/afs/andrew.cmu.edu/system/src/contributed/niftylibs/017/util
peso ; cd
peso ; - cd
cd /afs/andrew.cmu.edu/system/src/contributed/niftylibs/017/util
peso ; tail -7 $history
pwd
cd
cd /afs/andrew.cmu.edu/system/src/contributed/niftylibs/017/util
- cd
cd /afs/andrew.cmu.edu/system/src/contributed/niftylibs/017/util
cd /afs/andrew.cmu.edu/usr16/ps3u
tail -7 $history
peso ;
er, make that 2 extra lines per cd command (i forgot about the one
added by -(1) )
-dave
-----
fn cd {
builtin cd $1 && {
if (!~ $history ())
echo cd `pwd >>$history
switch ($1) {
case ()
PWD=$home
case *
PWD=()
}
}
}
fn pwd {
if (~ $PWD ())
PWD=`{builtin pwd}
echo $PWD
}
reply other threads:[~1991-12-17 8:17 UTC|newest]
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