How to set up and use aliases in Linux shell commands – Guide
An alias is known as a short name that the shell translates into another name or command. Aliases help describe new commands by exchanging a string for the first token of a simple command. They are commonly placed in ~ / .bashrc (bash) or ~ / .tcshrc (tcsh) startup files so that they are available to interactive subshells. In bash, the built-in alias syntax is In tcsh, the syntax is In bash syntax, no spaces are allowed around the equal sign. If the value has spaces or tabs, you must enclose it in quotation marks. Unlike aliases in tcsh, a bash alias does not accept a command-line argument in value. Use a bash function when you need to take an argument. An alias is not replaced, which avoids the possibility of infinite recursion when dealing with an alias like the following:
How to Create aliases on Linux
Creating aliases is a relatively easy and quick process. You can create two types of aliases – temporary and permanent. Let’s review both types.
Creating temporary nicknames
What you need to do is type the word alias and use the name you want to use to execute a command followed by the “=” sign and cite the command you want to create. The syntax is as follows: Here is a real example: You can then use the “wr” shortcut to go to the webroot directory. The problem with this alias is that it will only be available to your current terminal session. If you open a new terminal session, the alias will no longer be available. If you want to save your aliases between sessions, you will need a permanent alias.
Creating Permanent Aliases
To keep aliases between sessions, you can save them in the user’s shell configuration profile file. This can be: The syntax you should use is pretty much the same as creating a temporary alias. The only difference comes from the fact that you will be saving it to a file this time. For example, in bash, you can open the .bashrc file with your favorite editor like this: Find a location in the file where you want to keep the nicknames. For example, you can add them to final of the file. For organizational purposes, you can leave a comment before your aliases something like this: Save the file. The file will be automatically uploaded on your next session. If you want to use the newly defined alias in the current session, issue the following command: To remove an alias added via the command line, you can disable the alias using the unalias command.
Final note
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