bash
I use bash as my shell and as I have been using it for a while now, I felt it was time to get rid of an annoying setting. At the moment, the bash records EVERYTHING I do, including ALL the repetitive tasks e.g. each time I ssh to my home server. I know that bash is capable of storing each different command. e.g. stores 1 instance of ssh xxx.xxx.xxx.xxx instead of 7. So I did a little google and found this little gem. Thanks to this, my life is a little bit nicer.