# readable.awk --- library file to skip over unreadable files## Arnold Robbins, arnold@skeeve.com, Public Domain# October 2000BEGIN {    for (i = 1; i < ARGC; i++) {        if (ARGV[i] ~ /^[A-Za-z_][A-Za-z0-9_]*=.*/ \            || ARGV[i] == "-")            continue    # assignment or standard input        else if ((getline junk < ARGV[i]) < 0) # unreadable            delete ARGV[i]        else            close(ARGV[i])    }}