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#!/usr/bin/mawk -f # primes.awk # # mawk -f primes.awk [START] STOP # find all primes between 2 and STOP # or START and STOP # function usage() { ustr = sprintf("usage: %s [start] stop", ARGV[0]) system( "echo " ustr) exit 1 } BEGIN { if (ARGC == 1 || ARGC > 3 ) usage() if ( ARGC == 2 ) { start = 2 ; stop = ARGV[1]+0 } else if ( ARGC == 3 ) { start = ARGV[1]+0 ; stop = ARGV[2]+0 } if ( start < 2 ) start = 2 if ( stop < start ) stop = start prime[ p_cnt = 1 ] = 3 # keep primes in prime[] # keep track of integer part of square root by adding # odd integers odd = test = 5 root = 2 squares = 9 while ( test <= stop ) { if ( test >= squares )