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I want to create a shortcut for a command in terminal. Like for a command "ssh user@", I just want a command "user" and the above command will run. Is this possible, and if so how can it be done?

Thank you!

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The shortcuts for commands are known as aliases.
The syntax to create an alias is:

alias custom_command='original_command'  

For creating an alias for update and upgrade we should type the following in terminal,

alias update='sudo apt-get update'    

alias upgrade='sudo apt-get upgrade'  

So to create an alias for your command open the termianl and type:

alias user='ssh user@'
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If you want to have this command available in every terminal, you need to add this line to ~/.bash_aliases. Then it will be automatically loaded. – panmari Aug 3 '13 at 9:47
thank you tarun... – rohit Aug 3 '13 at 9:50
i dont have any ~/.bash_aliases file should i create it? – rohit Aug 3 '13 at 9:55
That depends on your ~/.bashrc . Does it source ~/.bash_aliases ? If yes, then just create it. – ahilsend Aug 3 '13 at 9:58
@rohit the .bash_aliases file is not a standard bash feature (I think it is an Ubuntu thing), the standard way is to add alias definitions to your .bashrc file. – terdon Aug 3 '13 at 15:17

Aliases can take parameters. For example:

$ alias 777='sudo chmod -R 777 '
$ 777 MyFolder

will perform chmod recursively on MyFolder

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Generally the answer is to alias your command, as mentioned by M.Tarun. For your example with ssh you might want to add it to your .ssh/config:

Host someName
     User user

Then call ssh with the name:

$ ssh someName

Your shell probably also has tab-completion for ssh. So you can just type ssh s and then hit Tab.

This also has the advantage that it works with other commands like scp:

$ scp some-file someName:a/path/

Whereas the alias approach would not work with this.

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If you want to not load the alias every time, to permanently store a alias command, do this.

Go to your home directory and press Ctrl+H to view hidden files, one of these files would be .bashrc. Open it.

Now write the following command anywhere in the mainspace:

alias custom_command='original_command' 

Your shortcut command will be stored permanently.

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