I have a couple basics I know by heart in awk, sed, and grep and those things enable me to be quick doing all sorts of stuff I need to do for large datasets on a daily basis. cat user_uuid_list | sed s/$/,/ sort of stuff. or anything tabular looking where I want specific columns (awk). maybe there are better ways, but I don't really care, as this works for me, is available everywhere, and I will never forget how to do it. I also use python for lots of stuff!