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Tutorial10: Shell Scripting - Part 1

12 bytes added, 07:53, 11 March 2021

→‎INVESTIGATION 1: CREATING A SHELL SCRIPT

# Use a '''text editor''' like '''vi''' or '''nano''' to create the text file called '''hello'''

# Enter the following two lines in your shell script, replacing "your-username" with your actual name: echo echo "Hello $USER" echo '''NOTE:''' The variable called '''USER''' is an '''environment variable''' that contains the current user's login name. If you wanted to share your shell script with other users, when they run the shell script, they will greeted by their username. ''Environment variables'' make your shell script adaptable by ALL users.

# '''Save ''' your editing session and '''exit ''' the text editor. Instead of issuing the '''bash''' command followed by your shell script pathname as an ''argument'', let's simply run it by its filename. This is the most common method of running shell scripts. [[Image:hello1.png|thumb|right|150px|Output of command from running your '''hello''' shell script (YourUserID is your username).]]

# Issue the following linux command to run your shell script in your current directory: ./hello '''You should notice an error indicating you don't have permissions to run the file'''. You need to first add '''execute permissions''' prior to running the shell script.

# Issue the following linux command to add execute permissions for your shell script: chmod u+x hello

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Tutorial10: Shell Scripting - Part 1

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