Shell Programming and Scripting

if [ $# -ne 1 ] || [ ! -d $1 ]
then
    echo "usage: $0 <directory>"
    exit 1
fi
SHOWSAME=1
find $1 -type f -ls | awk '
  $8 > 0 {
     gsub("\\\\ ", SUBSEP); F=$12; gsub(SUBSEP, " ", F); # Deal with space(s) in filename
     if($8 in sizes) {
         sizes[$8]=sizes[$8] SUBSEP F;
         dup[$8]++
     } else sizes[$8]=F
     bn=F;
     sub(".*/", "", bn);
     if (bn in basenames) {
         basenames[bn]=basenames[bn] SUBSEP F;
         dupname[bn]++
     } else basenames[bn]=F;
  }
  END {for(i in dup) print sizes[i]; print "-NOSAME-" ; for(i in dupname) print basenames[i]; }' | while read
do
  # SUBSEP (34 Octal) between each filename that has same size
  # Change IFS to Load Array F with a group of 2 (or more) files
  OIFS="$IFS"
  IFS=$(printf \\034)
  F=( $REPLY )
  IFS="$OIFS"
  [ "${F[0]}" = "-NOSAME-" -a ${#F[@]} -eq 1 ] && SHOWSAME=0
  i=0
  while [ $i -lt ${#F[@]} ]
  do
     let j=i+1
     while [ $j -lt ${#F[@]} ]
     do
        if cmp -s "${F[i]}" "${F[j]}"
        then
           [ $SHOWSAME -eq 1 ] && echo "\"${F[i]}\"" and "\"${F[j]}\"" are identical
        else
           [ "$(basename "${F[i]}")" = "$(basename "${F[j]}")" ] &&
               echo "\"${F[i]}\"" and "\"${F[j]}\"" have same filename but are different
        fi
        let j=j+1
     done
     let i=i+1
  done
done

#!/bin/bash
if [ $# -ne 1 ] || [ ! -d $1 ]
then
    echo "usage: $0 <directory>"
    exit 1
fi
SHOWSAME=1
find $1 -type f -ls | awk '
  {
     gsub("\\\\ ", SUBSEP); F=$NF; gsub(SUBSEP, " ", F); # Deal with space(s) in filename
     $1=$1
     SZ=$(NF-4)
     if(SZ > 0 && SZ in sizes) {
         sizes[SZ]=sizes[SZ] "\034" F;
         dup[SZ]++
     } else sizes[SZ]=F
     bn=F;
     sub(".*/", "", bn);
     if (bn in basenames) {
         basenames[bn]=basenames[bn] "\034" F;
         dupname[bn]++
     } else basenames[bn]=F;
  }
  END {for(i in dup) print sizes[i]; print "-NOSAME-" ; for(i in dupname) print basenames[i]; }' | while read
do
  # SUBSEP (34 Octal) between each filename that has same size
  # Change IFS to Load Array F with a group of 2 (or more) files
  OIFS="$IFS"
  IFS=$'\034'
  F=( $REPLY )
  IFS="$OIFS"
  [ "${F[0]}" = "-NOSAME-" -a ${#F[@]} -eq 1 ] && SHOWSAME=0
  i=0
  while [ $i -lt ${#F[@]} ]
  do
     let j=i+1
     while [ $j -lt ${#F[@]} ]
     do
        if cmp -s "${F[i]}" "${F[j]}"
        then
           [ $SHOWSAME -eq 1 ] && echo "\"${F[i]}\"" and "\"${F[j]}\"" are identical
        else
           [ "$(basename "${F[i]}")" = "$(basename "${F[j]}")" ] &&
               echo "\"${F[i]}\"" and "\"${F[j]}\"" have same filename but are different
        fi
        let j=j+1
     done
     let i=i+1
  done
done