Detailed explanation of the usage of the alias command under Linux

1. Use of alias

The alias command is used to set an alias for a command. We can use this command to simplify some longer commands.

Use alias short command = 'original command option'

alias 138ssh= 'ssh -i ~/.ssh/138.pem ec2-user@192.168.21.138'

Now you can directly use 138ssh instead of the original ssh -i ~/.ssh/138.pem ec2-user@192.168.21.138

View all current aliases alias-p

Remove an alias unalias command

Then I happily used the short command and no longer had to remember the server's IP address.

2. Alias ​​persistence

The next day when I was at work and happily typing out my short command, I found

I quickly ran to ask the operation and maintenance brother, and then he told me that alias needs to be reset every time it is restarted.

How can we play this?

Fortunately, the operation and maintenance brother taught me another trick

Add the alias command to /etc/.bashrc or ~/.bashrc file so you don't have to reset it every time you restart.

/etc/.bashrc is effective for all users, ~/.bashrc is effective for the current user
ps: My system is deep linux and the modified one is /etc/bash.bashrc

Finally, execute the source /etc/bash.bashrc command and the short command set by alias can be used again.

Note: source Filname reads and executes the commands in FileName in the current bash environment