Clear all Linux / UNIX bash shell aliases

Posted on in Categories , , , , , , , last updated July 12, 2007

Q. How do I clear all UNIX bash shell aliases get cleared in one command. I’ve 20 aliases sometime I just need to delete them in a current session. How do I get rid of all of them?

A. You need to use unalias command/

unalias command syntax

unalias name

To remove alias called foo, enter
$ unalias foo

alias command with no arguments or with the -p option prints the list of aliases:
$ alias
Output:

alias ll='ls -lh'
alias ls='ls --color=auto'
alias vi='vim '
alias c='clear'
alias d="/usr/local/bin/chkdomain $@"

Clear all Linux / UNIX bash shell aliases

It will remove NAMEs from the list of defined aliases. If the -a option is given, then remove all alias definitions.
$ unalias -a

Understanding command line shell

Posted on in Categories , , , , , , , , , last updated October 26, 2007

Q. I’ve migrated from Windows NT to Linux workstation. Most documents refer to a command line shell. Can you explain me command line shell?

A. A shell allows you to type the commands such as date or clear. There are many shell available. BASH (bourne again shell) is default shell for most Linux distributions.

It also known as a command interpreter which takes command from user and pass the same to kernel for execution. Bash shell supports aliases, filename completion, command history, POSIX compatibility and many other features.

Other UNIX / Linux shell

  • csh / tcsh
  • sh / ksh