git/usr/share/awk/zerofile.awk

# zerofile.awk --- library file to process empty input files
#
# user supplies zerofile() function
#
# This file and how to use it are described in the manual.
# Therefore, we respectfully advise you to Read The Fine Manual
# for more information.
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
# June 2003

BEGIN { Argind = 0 }

ARGIND > Argind + 1 {
    for (Argind++; Argind < ARGIND; Argind++)
        zerofile(ARGV[Argind], Argind)
}

ARGIND != Argind { Argind = ARGIND }

END {
    if (ARGIND > Argind)
        for (Argind++; Argind <= ARGIND; Argind++)
            zerofile(ARGV[Argind], Argind)
}