Creating Custom Commands with alias in Linux

Linux offers flexible customization tools for command-line users. Among them, the alias command lets you create custom shortcuts for frequently used or multi-step commands. This enhances workflow speed and reduces repetitive typing. This article explains how to define, verify, remove, and persist aliases efficiently.

Running Multiple Commands on One Line

You can chain commands using semicolons:

command1; command2; command3

Example:

cd /usr; ls; cd -

This changes to /usr, lists its contents, then returns to the previous directory. Such sequences are ideal candidates for alias shortcuts.

Checking for Existing Command Names

Before assigning an alias, use type to check if the name already exists:

type command_name

Example:

type test

Output:

test is a shell builtin

Choose a different name, such as foo:

type foo

Output:

bash: type: foo: not found

Creating an Alias

Syntax:

alias name='command'

• name: Alias name
• command: Commands to execute

Example

alias foo='cd /usr; ls; cd -'

Now, running:

foo

Will execute all three commands.

Checking Defined Aliases

type foo

Output:

foo is aliased to `cd /usr; ls; cd -'

To see all defined aliases:

alias

Common Fedora Aliases

alias l.='ls -d .* --color=tty'
alias ll='ls -l --color=tty'
alias ls='ls --color=tty'

Removing an Alias

Use unalias to delete:

unalias foo
type foo

Output:

bash: type: foo: not found

Making Aliases Persistent

Aliases created in the terminal last only for the current session. To make them permanent, add them to:

• ~/.bashrc
• or ~/.bash_aliases (if your system supports it)

Conclusion

The alias command provides a simple way to enhance command-line efficiency by creating custom shortcuts. With clear naming, proper management, and persistence setup, aliases become a powerful tool for terminal productivity.