The bash reverse-i-search is very usefull when needing to lookup for a command in the history.
Press Ctrl – R and you get this: (reverse-i-search)`’:
Type parts of the command you need to find and bash will give you the related command.
I typed less and file in the reverse-i-search:
$ [Ctrl - R]
(reverse-i-search)`less': ls -a | grep "^." | less
$ [Ctrl - R]
(reverse-i-search)`file': file /usr/share/man/man1/deja-dup-preferences.1.gz
This is a bash trick. To read the other bash tricks, click here.