![]() The table below highlights the most common special built-in bash variables: Special Variable I suggest reading about stderr redirection in Linux and /dev/null to get more knowledge on this topic.īonus Tip: Special variables in Bash shellīash has a lot of built-in special variables that are quite handy and are available at your disposal. If you are wondering about the 2> /dev/null, it means that any error message (like file cannot be accessed) won't be displayed on the screen. You see how this is now much easier than typing the whole find command! This is a proof that you can use arguments to turn any long complicated command in Linux to a simple bash script. It’s a very simple script that yet can prove very useful! You can supply any filename as an argument to the script and it will display the location of your file: The following script count_lines.sh will output the total number of lines that exist in whatever file the user enters: #!/bin/bash In this tutorial, you will learn how you can pass variables to a bash scripts from the command line. So far, you have learned how to use variables to make your bash scripts dynamic and generic, so it is responsive to various data and different user input. Arguments can be useful, especially with Bash!
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