How to create and store Alias in Linux

Alias

Aliases are shortcut names for longer commands. If you have commands that you run often, but take a considerable amount of typing, you can reduce these to an alias:
[user@statuionX ~]$ alias lf="ls -FCa"
The alias value must be a single word and so you will almost always want to quote the value as shown.
Even a relatively short command, if executed often, can save considerable typing if reduced to an alias:
[user@stationX ~]$ alias c=clear
Aliases can also be used for security purposes to force you to use certain flags:
[user@stationX ~]$ alias rm="rm -i"
In this case, if you ever want to use the rm command itself, instead of your alias, you can precede the command with a backslash:
[user@stationX ~]$ \rm -r Junk

Example: –

Goal

Create an alias that provides easy acccess to your shell’s history, and which is re-instated automatically for new shells.

1. Device a command that would print the last 10 lines of bash’s command history.
   Suggested Solution:
   history 10
2. Create an alias called h that runs the history command devised above:
   
   [amar@amar-pc ~]$ alias h='history 10'
[amar@amar-pc ~]$ alias
alias h='history 10'
..... output omitted ....
3. Create a new shell (for example, by opening a new tab with Ctrl-Shift-t).
4. Attempt to execute the h alias. This should not work. Why?
5. Open ~/.bashrc in a text editor and locate the line:
   # User specific aliases and functions
   Add your alias to the line immediately below:
   alias h=’history 10′
   save the file and exit.
   
   Note: if not found ./bashrc file then you can create.
   
6. Source the newly modified file:
   [amar@amar-pc ~]$ source ~/.bashrc
   
7. Attempt to run h again. This time it should succeed. The same should be true if you create another new shell.