Changing Linux Shell

Linux SHELL 

Shell is a program that provides a traditional Unix-like command line user interface (CLI). It executes commands read from the standard input device (keyboard) or from a file, create files, and more using the system kernel.

Important Notes

• • HPC provides BASH (Bourne-Again SHell) shell environment by default

Changing SHELL

Shell Options

See the available SHELL options

cat /etc/shells

output:

/bin/sh

/bin/bash

/bin/dash

/bin/ksh

/bin/tcsh

/bin/csh

Change current shell

Interactive Job:

The shell be changed to tcsh from bash

srun --pty /bin/tcsh    # for tcsh shell

You will be assigned a compute node with tcsh shell.

Test the current shell

echo $0

output:

/bin/tcsh

Batch Job:

In the job script, the first line becomes:

#!/bin/tcsh    # for tcsh shell

Change the Shell Permanently

If you need to change your shell from Bash to something else permanently, please contact us at hpc-supportATcase.edu.