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Determine space taken by files of certain type
Just how much space are those zillions of database logs taking up ? How much will you gain on a compression rate of say 80% ? This little line gives you a good start for your calculations.

Generate list of words and their frequencies in a text file.

get bofh excuse from a trusted source :-)

skip broken piece of a loop but not exit the loop entirely
useful for loops like for i in $(cat list_of_servers); do ssh -q $i hostname; done if there is an unreachable server, you can just press ctrl + \ to skip that server and continue on with the loop

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Print entire field if string is detected in column
It searches for a specific value in the specified column and if it finds it it'll print the whole field/row. Similarly, if you don't know what you're looking for exactly but want to exclude something you're already aware of, you can exclude that "something: awk '{ if ($column != "string") print $0}'

Automator Bash script to create Clean zips in MacOS Finder without __MACOSX metadata
Finder compresses to ZIP but always includes extraneous metadata files (__MACOSX and .DS_Store) files and folders that may confuse other programs. One alternative is creating them and then editing the ZIP. This can work standalone or in an automator script accepting multiple selections (files or folders) and creating one zip per argument/selected file without that metada.

Get the full path to a file
Part of coreutils - so needs no extra package...

ls -qahlSr # list all files in size order - largest last
I find it useful, when cleaning up deleting unwanted files to make more space, to list in size order so I can delete the largest first. Note that using "q" shows files with non-printing characters in name. In this sample output (above), I found two copies of the same iso file both of which are immediate "delete candidates" for me.

git diff of files that have been staged ie 'git add'ed


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