Tip: sudo in the last command in Linux bash shell quickly.

In this post, we will look at an interesting topic how to refer the last command in bash shell.

We can reuse the previous command inside present command with a special bash built-in “!!”

 

Sudo last command quickly

### Run the command
[nglinux@nglinux ~]$ tail /var/log/messages 
tail: cannot open `/var/log/messages' for reading: Permission denied


### Write sudo and run last command quickly
### By referring it with !!

[nglinux@nglinux ~]$ sudo !!
sudo tail /var/log/messages 
[sudo] password for nglinux: 
Feb 22 10:48:01 localhost rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="1478" x-info="http://www.rsyslog.com"] rsyslogd was HUPed
[nglinux@nglinux ~]$ 

We can call the entire previous command by using this special builtin “!!”.

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