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# Linux alias Command [ Linux Command Manual](#) The Linux alias command is used to set aliases for commands. Users can use alias to define custom command aliases. It allows you to execute commands in a simpler and more memorable way, without having to type the full command every time. If you simply type `alias`, it will list all current alias settings. The effect of an alias is only valid for the current login session. If you want it to take effect every time you log in, you can set the command alias in `.profile` or `.cshrc`. ### Syntax alias= **Parameter Description**: If no parameters are provided, it lists all current alias settings. ### Examples 1. Create an alias: alias ll='ls -alF' This command creates an alias named `ll`, which is used to display a detailed list of all files and directories in the current directory. 2. Display aliases: alias This command will display all aliases and their corresponding commands on the current system. Delete an alias: unalias ll This command will delete the alias named `ll`. 3. Execute a command with root privileges: alias sudo='sudo ' This command will create an alias named `sudo`, so you can execute commands with **root** privileges by adding `sudo` before the command. **Note:** There is a space at the end of the command. This is because without the space, the command executed with root privileges may not be recognized correctly. 4. Add timestamps to history: alias history='history | awk '"'"'{CMD="date +"[%Y-%m-%d %H:%M:%S]""; print CMD " " $0 }'"'"' | cut -c 29-' This command will create an alias named `history`, which will add timestamps when you execute the history command. **Note:** This command contains multiple single and double quotes inside the single quotes, which need to be escaped correctly. 5. Enable color output Using the `--color=auto` parameter in the alias command allows the command to automatically enable color output on terminals that support it, thereby improving the readability of the command line. For example: alias ls='ls --color=auto' This command will create a simplified `ls` command that automatically enables color output. [ Linux Command Manual](#)