Some useful variables and settings in the Korn Shell

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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 08:25:32)


 Associated topics are indexed under
A172 - Web Application Deployment - Korn Shell - interactive and programming facilities



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