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Permanent Alias in Centos



Alias is a way to pair a command with a name of your choice. For example when you use ls , it is actually ls='ls --color=auto' it has and alias to ls and when you commit ls it executes ‘ls --color=auto’  . if you execute the command alias you will get something like this :
alias cp='cp -i'
alias l.='ls -d .* --color=auto'
alias ll='ls -l --color=auto'
alias ls='ls --color=auto'
alias mv='mv -i'
alias rm='rm -i'

If you want to set an alias for the current session just type
# alias ll='ls -lah'
If you want to remove an alias for the current session just type
$unalias ll

 

Aliases in Centos

You can add a permament alias in centos using the following simple steps:

1st step Create a file in /etc/profile.d/ directory

create a file with filename relative to the command you want to make an alias (this is just a mnemonic hint) inside the directory: /etc/profile.d/ as is shown in the following example:
vi /etc/profile.d/whoIsTheboss.sh
In this example I need to create an alias for the command whoIsTheBoss, so I name my file whoIsTheboss.sh

2nd step Define the alias in the file

Insert in the alias’s definition file something like the following:

alias whoIstheBoss="echo Mr.Hossein Davoodi"

this command is full of smugness,isn’t it? J
I am not smug , it is just for fun J

3rd step Give the right permissions to the file

You have to run the following command, where ldapsearch.sh is an example
chmod 755 /etc/profile.d/whoIsTheboss.sh

4th step Restart your session Or Source the file you created

Now you have to either restart your session, by exiting the terminal, and open a new one, or use the following command:
source /etc/profile.d/whoIsTheboss.sh

now the bash knows about your command(alias), and whenever you type it , it will respond to you easily.you can add long commands to a file like the one I have just made and execute it in a øyneblink(Scandinavian equivalent for eye blink).

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