Linux Command alias/unalias

Alias
 
Function Description:
 
SET command alias
 
Syntax:
 
Alias [alias] = [command name]
 
Parameters:
 
: If no parameter is added, all current alias settings are listed.
 
 
 
Unalias

Function Description:
 
Delete alias
 
Syntax:
 
Unalias [-a] [alias]
 
Note:
 
Unalias is a shell built-in command that deletes alias settings.
 
Parameters:
 
-A: delete all aliases.
 
Command practice:

[Root @ www.bkjia.com ~] # Alias view the current command alias
 
Alias cp = 'cp-I'
 
Alias l. = 'LS-d. * -- color = tty'
 
Alias ll = 'LS-l -- color = tty'
 
Alias ls = 'ls -- color = tty'
 
Alias mv = 'mv-I'
 
Alias rm = 'rm-I'
 
Alias which = 'Alias |/usr/bin/which -- tty-only -- read-alias -- show-dot -- show-tilde'
 
[Root @ www.bkjia.com ~] # Alias lm = 'LS-l | more'
 
[Root @ www.bkjia.com ~] # Alias
 
Alias cp = 'cp-I'
 
Alias l. = 'LS-d. * -- color = tty'
 
Alias ll = 'LS-l -- color = tty'
 
Alias lm = 'LS-l | more '<=
 
Alias ls = 'ls -- color = tty'
 
Alias mv = 'mv-I'
 
Alias rm = 'rm-I'
 
Alias which = 'Alias |/usr/bin/which -- tty-only -- read-alias -- show-dot -- show-tilde'
 
[Root @ www.bkjia.com ~] # Unalias lm cancelling command alias
 
[Root @ www.bkjia.com ~] # Alias
 
Alias cp = 'cp-I'
 
Alias l. = 'LS-d. * -- color = tty'
 
Alias ll = 'LS-l -- color = tty'
 
Alias ls = 'ls -- color = tty'
 
Alias mv = 'mv-I'
 
Alias rm = 'rm-I'
 
Alias which = 'Alias |/usr/bin/which -- tty-only -- read-alias -- show-dot -- show-tilde'
 
[Root @ www.bkjia.com ~] #