Linux / UNIX: Command For Executing a Shell Script

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
OR
$ 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
OR
$ bash your-script-name-here
OR
$ sh your-script-name-here
OR
$ ksh /nas/server/scripts/my.ksh

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Bash Shell Script Example

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

#!/bin/bash
# test.sh - 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 test.sh
$ ./test.sh

Sample outputs:

Hello vivek,

Current date and time set to "Fri Jul 15 15:24:12 IST 2011" on the "sai.nixcraft.net.in" 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  

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1 comment… add one
  • Shuaib Shahzan Jun 27, 2013 @ 11:05

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

    ex: . my_script.sh

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

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