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On the latter, an example that comes to mind is how to specify field numbers: -f in cut, -k in sort, -j for the most common option in join.

And specifying field delimiters: -d in cut, -t in sort, -F in awk.

Ach, those always get me. Thankfully most (all?) of those also respect the `$IFS` variable, which is what I tend to use.

None of them should respect IFS — that’s only for the shell.

Huh. I could have sworn that GNU Awk respects IFS, but I can't find that in the manual now. Maybe I dreamed it up.