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Hey!

This is an awesome little trick I just learnt about:

instead of doing

mv file1.txt file1.txt.old

you can do this

mv file1.txt{,.old}

and it will automagically add a .old at the end of the filename.

This is called a brace expansion: http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_03_04.html