Alias Command in Unix and Lunix

• Alias is a shortcut to reference a command. 
• It can be used to avoid typing long commands that are frequently used.
• For common patterns it can reduce keystrokes and improve efficiency. 

One best example why we will use alias ?
A user want to delete a file with confirm delete option for that we type
rm -i file.txt
remove file.txt? y
But some time we forgot to write -i , to avoid this such issue we use alias.

Command	Desc
Syntax Of alias	alias [-p] [name="value"]
Example:
alias	It will show you list of alish which is present in system
alias ls="ls -al"	lists the names of the files and directories within the current directory
alias df="df -h"	size, amount of space used, amount of space available (-h) in MB and GB
alias rm="rm -i"	increasing the safety of the system by making commands interactive. It is use for remove files
alias cp="cp -i"	increasing the safety of the system by making commands interactive .It is use for copy files
Removing Aliases
Syntax	unalias [-a] name(s)
Example:	unalias rm