Shell Programming and Scripting

Hi All,

I am new in UNIX.I have a situation here.
I have a script which have to be run in every shell (like KSH,BASH,CSH).
Script may be any thing.
But i don't know how to do it.Because the syntax of every shell may be different.


Please advise..
Thanks for your kind advise in advance.

IMO - this cannot be a sane requirement for business purposes. It has to be homework.
Or the result of completely uninformed management run amok.

One single set of script language lines is going to have lots of problems running under csh and then bash/ksh. A probably not very useful script made entirely of unix commands will work

Code:

/usr/bin/ls /home/jdash.ps
/usr/bin/date
/usr/bin/printf "%s\n"  "hi there"

What are you trying to do? I

There is too much difference in the syntax between "csh" and the various Bourne-like shells to write common shell code.
The usual approach is to put a shebang line at the front of the script to force the site standard shell regardless of the parent shell.
For example:

Code:

#!/bin/ksh

This may not be what you meant.

Hi all,

Thanks for the answer.
Jim and methyl you both are quite right.


but the requirement is like that.
I have to run the script in ksh and bash in both shell .U can leave "Csh".its not necessary.

That's why my question : Is there any common syntax for writing the script to be run in both shell.

It's not easy.

Some would say invoke Posix mode in bash and then only use syntax which is common to ksh. The really big differences come with the external commands and you will inevitably have to test for the Operating System version before issuing some commands.


One of many sites which list differences between various Bourne-like shells, shell constructs and external commands.
Portable Shell - Autoconf

Thanks methyl u r just too good...