[SOLVED] Run script in kSh

SharonGe · 10-24-2010, 01:32 AM

Hi,
I want to run some ksh script in my virtual machine which is in ubuntu. Although I have install ksh, the shell is always remain in bash. What was wrong? Please help.

mesiol · 10-24-2010, 01:41 AM

Hi,

your login shell will be bash per default. To run a script in a ksh environment add a hash bang like this to the first line of your script

Code:

#!/bin/ksh

. This will create a ksh shell, inside this shell only the script will run. There is no need to change your login shell.

If you like to test/develop your script in ksh, easily run

Code:

ksh

.

jdkaye · 10-24-2010, 01:44 AM

Assuming you have installed the ksh package, have you tried running

Code:

ksh93

from the commandline to see what happens?
ciao,
jdk

David the H. · 10-24-2010, 02:22 AM

If you're talking about setting a different default shell for the user, there's a tool for that: chsh.

It's also possible to do it by manually modifying the user's entry in the /etc/passwd file.

SharonGe · 10-24-2010, 12:28 PM

I think I didn't explain my question well, sorry
I tried to figure what shells I have and did the following:
user@user-desktop:~/Desktop$ cat /etc/shells
# /etc/shells: valid login shells
/bin/csh
/bin/sh
/usr/bin/es
/usr/bin/ksh
/bin/ksh
/usr/bin/rc
/usr/bin/tcsh
/bin/tcsh
/usr/bin/esh
/bin/dash
/usr/bin/screen
/bin/bash
/bin/rbash
/bin/ksh93
Then I think I probably type "ksh" and will change shell, but
user@user-desktop:~/Desktop$ ksh
$ echo $SHELL
/bin/bash

see, it is showing the current shell is still bash.

What I really want to do is to test a simple ksh script; I plan to change my shell temporary and see if the script is working. I know it is a really stupid question, but I am too new in linux.

jdkaye · 10-24-2010, 12:51 PM

That seems to be just a list of all possible shells. Running the same command on my system also shows ksh but it is not installed on my system.

Code:

# /etc/shells: valid login shells
/bin/csh
/bin/sh
/usr/bin/es
/usr/bin/ksh
/bin/ksh
/usr/bin/tcsh
/bin/tcsh
/usr/bin/esh
/bin/dash
/bin/bash
/bin/rbash

jdk

SharonGe · 10-24-2010, 01:08 PM

Wow! I thought I did install from "synaptic package manage", because I install my emacs from there and it is working. If that is the case, Can I find a manual or guide to finish the installation?

Quote:

Originally Posted by jdkaye

That seems to be just a list of all possible shells. Running the same command on my system also shows ksh but it is not installed on my system.

Code:

# /etc/shells: valid login shells
/bin/csh
/bin/sh
/usr/bin/es
/usr/bin/ksh
/bin/ksh
/usr/bin/tcsh
/bin/tcsh
/usr/bin/esh
/bin/dash
/bin/bash
/bin/rbash

jdk

mesiol · 10-24-2010, 11:20 PM

Hi,

From the bash man page

Code:

SHELL  
The full pathname to the shell is kept in this environment variable. 
If it is not set when the shell starts, bash assigns to it the full pathname
of the current user’s login shell.

and in you example, ksh is not your login shell.

jdkaye · 10-24-2010, 11:38 PM

Quote:

Originally Posted by SharonGe

Wow! I thought I did install from "synaptic package manage", because I install my emacs from there and it is working. If that is the case, Can I find a manual or guide to finish the installation?

Code:

aptitude search ksh

This will tell you if ksh is installed or not.
ciao,
jdk