Linux / UNIX: Command For Executing a Shell Script

Posted on in Categories last updated July 15, 2011

How do I execute a script under UNIX or Linux like operating system using command prompt?

First, you need to set the execute permissions on your script. This can be done using the chmod command as follows:
$ chmod +x your-script-name-here
$ chmod u+x your-script-name-here
Next, check that you got the permissions that you want with the ls -l command:
$ ls -l your-script-name-here
Finally, you can execute a script using any one of the following syntax:
$ ./your-script-name-here
$ bash your-script-name-here
$ sh your-script-name-here
$ ksh /nas/server/scripts/my.ksh

Bash Shell Script Example

Create a shell script called
$ vi
Add the following code:

# - A sample shell script
# Author - Vivek Gite
# Tested under Debian GNU/Linux using Bash shell version 4.x
# -----------------------------------------------------------------------------
echo "Hello $USER,"
echo "Current date and time set to \"$(date)\" on the \"$HOSTNAME\" system."
echo "Amount of free and used memory in the system:"
free -m

Save and close the file. Run it as follows:
$ chmod u+x
$ ./

Sample outputs:

Hello vivek,

Current date and time set to "Fri Jul 15 15:24:12 IST 2011" on the "" system.

Amount of free and used memory in the system:

             total       used       free     shared    buffers     cached
Mem:          7930       3699       4230          0         78       2115
-/+ buffers/cache:       1505       6424
Swap:         8114  

More links and information :

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

1 comment

  1. We could also execute the script without setting the execute permissions on the script.

    ex: .

    Even if the execute permissions are not set for the script, even then it will get executed.

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