How to Make Bash Script Executable Using Chmod

touch hello_script.sh

$ vim hello_script.sh

#!/bin/bash
echo "Hello World"

Step 3: Executing the Bash Script

There are two ways to run the bash file. The first one is by using the bash command and the other is by setting the execute permission to bash file.

Let’s run the following command to execute the bash script using bash or sh command.

bash hello_script.sh

or

sh hello_script.sh

Step 4: Set Executable Permissions to Script

The second way to execute a bash script is by setting up the executable permissions.

To make a script executable for the owner of the file, use u+x filename.

chmod u+x hello_script.sh

To make the file executable for all users use +x filename or a+x filename.

chmod +x hello_script.sh

Step 5: Running Executable Script

After you have assigned the executable permissions to the script, you can run the script without bash command as shown.

$ ./hello_script.sh

Another Example

In the following example, I am going to write and execute a bash script to take a backup from source to destination.

$ vim backup_script.sh

#!/bin/bash
TIME=`date +%b-%d-%y`
DESTINATION=/home/ubuntu/backup-$BACKUPTIME.tar.gz
SOURCE=/data_folder
tar -cpzf $DESTINATION $SOURCE

Save and close the file using :wq! and give it the executable permissions for all users using the following command:

$ chmod +x backup_script.sh

Now run the script:

$ ./backup_script

Conclusion

At the end of this tutorial, you should be familiar with how to set a script executable in Linux.

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