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############################################################################
#
# File: comfiles.icn
#
# Subject: Program to list common files in two directories
#
# Author: Ralph E. Griswold
#
# Date: March 21, 1994
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program lists common file names in two directories given as
# command-line arguments.
#
############################################################################
#
# Requires: UNIX
#
############################################################################
procedure main(args)
local dir1, dir2, set1, set2, set3, input1, input2
dir1 := args[1] | stop("*** no directories specified")
dir2 := args[2] | stop("*** no second directory specified")
set1 := set()
set2 := set()
input1 := open("ls " || dir1, "p")
input2 := open("ls " || dir2, "p")
every insert(set1, !input1)
every insert(set2, !input2)
set3 := set1 ** set2
if *set3 = 0 then write("no common file names")
else every write(!set3)
end
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