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I always used to wonder where to put unix based scripts on my Mac without them getting in the way. The solution is simple: create a bin folder in your home directory, and add it to the path: export PATH=~/bin:$PATH(from the Advanced Command Line Screencasts)

If you edit your .bash_profile you will need to either quit your current terminal window and open a new one, or run this command to reload the settings: source ~/.bash_profile.

Looking for files inside an archive, without having to extract them first? Using Apple's Terminal, or any Unix / Linux bash shell:

find /dir/ -iname archive.tar -print0 | xargs -0 tar t -f | grep "filename you are searching for"
find /dir/ -iname archive.zip -print0 | xargs -0 unzip -l | grep "filename you are searching for"
find /dir/ -iname archive.rar -print0 | xargs -0 unrar l | grep "filename you are searching for"

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To list files that were changed in the last day, sorted by size, using Apple's Terminal, or any Unix / Linux bash shell: sudo find / -type f -mtime -1 -print0 | xargs -0 du -sk | sort -nr(thanks mynamewasgone!)
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To change the command line prompt on bash, my shell of choice, you need to edit the file .bash_profile in your home directory. To do that, UNIX machos will tell you to use vi. This I find only slightly less painful than walking on my knees on dried chickpeas, and I won't touch it (I won't even touch vim, its marginally less awkward cousin). More →