Being a command line junkie I am always looking at ways to make my life easier and for that to happen I need to be able to do things faster. As a result I thought it worth while mentioning CTRL+R on the command line, also known as reverse-i-search.
Using CTRL+R will allow you to search through your previously entered commands to help prevent having to write them out again.
(reverse-i-search)`tai’: tail -f /var/log/apache/error.log
Once you have pressed CTRL+R start typing the command you have previously used and it will appear.
It’s extremely useful and will become second hand to you if you use it enough.