#!/bin/sh

#  Program name:  comp_dirs_file_match
# 
#  I had two directories with a ton of files in each:
#  
# ~/cpprogs
# ~/ap/e/cpprogs
#
#  I didn't want to just copy the contents of one into the 
#  other and overwrite a better version with a crappy one 
#  so I thought it was a good excuse to write a sh script <;) 
#

echo -e "\
#####################################################################\n\
    Comparing Directories for matching files: \n";


echo -e "\n########## getting clargs ##########\n";

echo -e "  $# parameters given: \n  $@\n";
echo -e "That's:  $1   \n   and:  $2";
echo;

if [ $# -lt 2 ]; then  
  echo "dude , please  2 directoy names on the command line"; 
  exit;
fi;

echo -e "\n########## test for "name is directory?" ##########\n";

((t1=0));       # enclose in (( )) for  math operations.   

if [ -d $1 ]; then echo "$1 - YES"; else echo "$1 - NO"; ((t1+=1)); fi; 
if [ -d $2 ]; then echo "$2 - YES"; else echo "$2 - NO"; ((t1+=1)); fi;
echo $t1;
echo

echo -e "########## string comparison test ##########\n";

a="hello";
b="hello";

if [ "$a" == "$b" ] ; then
  echo "$a matches $b";
else
  echo "$a does NOT match $b";
fi;
echo;


echo -e "\
##################################################################### \n\
#  Ok so loop on ls of first directory given and take each filename \n\
#  to a loop on ls of the second directory and compare the words for \n\
#  match: \n\ 
##########\n";

t1=0;
((t2=0));

for fn1 in $(ls $1); do
  #  echo $fn2;
  ((t1++));
  for fn2 in $(ls $2); do
    if [ "$fn1" == "$fn2" ]; then  echo "Match found: $fn1"; ((t2++)); fi;
  done;   
done;
echo -e "  Total: $t1 file names checked in $1 \n         $t2 matches found";

echo -e "\n########## WOW - how simple! ##########\n";