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Comment by leblancfg | Hacker News Reader

Yes. Or if you're going to whip out Python, might as well make it all in Python.

Very much my thinking, especially when there are no significant commands you need to shell out to:

    import sys, pathlib
    basedir = pathlib.Path(sys.argv[1])
    for i in range(1, 501):
        if not (basedir / f'{i:04}_A.csv').is_file():
            print(i)

Nice one!

Just for fun some bash:

    for k in $(seq -f %04.f 1 501); do 
        f="${k}_A.csv"
        ! [[ -f "$f" ]] && echo $f || :
    done

or more succinctly,

    for k in {0001..0501}_A.csv; do
        ! [[ -f "$f" ]] && echo $f || :
    done

and if you have GNU parallel installed:

    parallel -kj1 '! [[ -f "{}" ]] && echo {} || :' ::: {0001..0501}_A.csv

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