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Some useful variables and settings in the Korn Shell

Here are some hidden "gems" ...

• -C sets "noclobber" mode in which redirects do not overwrite files

$ set -C
$
$ ls > fred
$ ls > fred
ksh: cannot create fred: File exists
$ set +C
$ ls > fred
$


• CDPATH lets you change the target for your cd command to a list of directories whihc are searched in turn.

$ CDPATH=/etc:/bin
$ pwd
/home/trainee/sefas/f
$ cd
$ pwd
/home/trainee
$ cd init.d
/etc/init.d
$

• OLDPWD remembers where you were last in ksh, and cd - takes you there

$ pwd
/home/trainee
$ echo $OLDPWD
/etc/init.d
$ cd -
/etc/init.d
$


• Korn Shell - elapsed seconds, and a randon number between 0 and 32767

$ echo $SECONDS
14294
$ r
echo $SECONDS
14297
$ r
echo $SECONDS
14299
$ r
echo $SECONDS
14301
$ echo $RANDOM
28369
$ r
echo $RANDOM
5877
$ r
echo $RANDOM
28995
$

(written 2008-05-30)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A172 - Web Application Deployment - Korn Shell - interactive and programming facilities
  [1660] Korn shell - some nuggets - (2008-05-30)
  [1659] String, Integer, Array, Associative Array - ksh variables - (2008-05-30)
  [1367] korn tips - some useful korn shell techniques - (2007-09-25)
  [1365] Korn Shell scripts on the web - (2007-09-25)
  [1364] Korn shell course - resources - (2007-09-24)
  [1361] Korn shell course - (2007-09-22)


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