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sh - create simple bin sh shell script with .sh code example

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Created by:

marc_so

1104

1. Correct header for a bash script

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xxxxxxxxxx
 
#!/bin/sh

2. Simple bash sh script with .sh header

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Filename eg bash_test.sh

Code example:

xxxxxxxxxx
 
#!/bin/sh
​
# print to console
echo 'Hello World'
​
# will wait until user press Enter
read

Output:

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Hello World

3. Steps with explanation how to run this example

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Create file bash_test.sh (any file works with .sh extension)
Open console in the same directory as our bash_test.sh
Enter: $ sh bash_test.sh
We see the same result as on below screenshot with result.
If you want to exit script press Enter.

Screenshot with result of bash_test.sh script:

4. Sh header explanation - Shebang

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This header #!/bin/sh at the beginning of the sh file in Unix is called - 'Shebang'.
The purpose of this header:

Shebang is used to detect what interpreter will be used to run the script.

Most popular shebang:
#!/bin/sh – Execute the file using the Bourne shell, or a compatible shell
#!/usr/bin/env python – Execute with a Python interpreter

Read more about Shebang on wikipedia - Shebang-(Unix)

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