When I was working on a Terminal, I used to type lots of cd and cd .. to go back and forth the directory. Too often, when I went to deep into the directory hierarchy, I got to type multiple times cd .. just to move up to parents, or a long command like cd ../../../../../.

I got frustrated every freaking time doing this, so I thought of an more easy way to type once and it got me to the correct directory up in the hierarchy, I call the alias two-dots.

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# Add this into your ~/.bashrc or ~/.zshrc
function back() { for x in {1..${1:-1}}; do cd ..; done }
alias ..='back'

How it works:

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# Suppose your are in
$> cd some/project/that/has/a/very/deep/directory/structure

structure $>

# Say you need to go back to 'that' directory.
# Normally, it requires 6 times typing "cd .." to achieve this.
$> .. 6

that $>

If you want to more enhanced version of back() such that typing .. 6 or .. that will produce the same result, you can check out my Gist: