taketilcap

#!/bin/bash
usage='usage taketilcap [-h|--help] <capacity>

-h  Show help

Filter newline-delimited filenames provided on stdin'

[[ $# -lt 1 ]] && {
    echo "$usage"
    exit 1
}
case "$1" in
-h|--help) echo "$usage"; exit 0;;
esac

cap=$1

xargs -d '\n' stat --printf "%W\034%s\034%n\n" \
    | sort -k 1n \
    | gawk -v cap=$(numfmt --from=si "${cap^^}") '
        BEGIN {
            FS = "\034"

            # Field indexes
            size = 2
            name = 3
        }
        {
            cap -= $(size)
            if (cap < 0) {exit 0}
            print $(name)
    }'