Setting the CDPATH environment variable saves you having to cd to commonly-used parent directories. I usually put my main workspace directory in there to allow direct directory changes to project dirs, as well as ‘..’ to allow jumping to sibling directories.
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After finding that we had a few images checked into our project's repository but that were not referenced in the project, I wanted to write a script to quickly see if there were any other unused assets.
This was a one-off script, so it probably won't suit everyone's needs, but here's how we approached the problem: