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Full Discussion: Search compare and determine duplicate files
Top Forums Shell Programming and Scripting Search compare and determine duplicate files Post 302508689 by Chubler_XL on Monday 28th of March 2011 05:50:43 PM
Old 03-28-2011
I'm not aware of any packages that do it, how about this script to find identical files:

Code:
if [ $# -ne 1 ]
then
    echo "usage: $0 <directory>"
    exit 1
fi
find $1 -type f -ls | awk '$7 > 0 { if($7 in sizes) { sizes[$7]=sizes[$7] SUBSEP $11; dup[$7]++} else sizes[$7]=$11 } END {for(i in dup) print sizes[i] }' | while read
do
   OIFS="$IFS"
   IFS=$(printf \\034)
   F=( $REPLY )
   IFS="$OIFS"
   i=0
   while [ $i -lt ${#F[@]} ]
   do
       let j=i+1
       while [ $j -lt ${#F[@]} ]
       do
            if cmp -s "${F[i]}" "${F[j]}"
            then
                echo ${F[i]} and ${F[j]} are identical
            fi
            let j=j+1
       done
       let i=i+1
   done
done

It does a find dir -type f -ls and stores filename in an awk array with size as the index. If a file with the same size is found the size is written into the dup array. At the end all duplicate sizes are output in a SUBSEP list.

This list is read into the F array and cmp with the -s flag (ie no output, just exit status) is used to compare files - this command will stop comparing as soon as the first difference is found which is better than calculating CRCs for each file.

Note: if files A B C are identical you will get output
A is identical to B
A is identical to C
B is identical to C
This can be fixed with more logic, but I don't consider it an issue.
Last edited by Chubler_XL; 03-28-2011 at 07:20 PM..
 

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LEARN ABOUT FREEBSD

cmp

CMP(1)							    BSD General Commands Manual 						    CMP(1)

NAME

     cmp -- compare two files

SYNOPSIS

     cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]

DESCRIPTION

     The cmp utility compares two files of any type and writes the results to the standard output.  By default, cmp is silent if the files are the
     same; if they differ, the byte and line number at which the first difference occurred is reported.

     Bytes and lines are numbered beginning with one.

     The following options are available:

     -h      Do not follow symbolic links.

     -l      Print the byte number (decimal) and the differing byte values (octal) for each difference.

     -s      Print nothing for differing files; return exit status only.

     -x      Like -l but prints in hexadecimal and using zero as index for the first byte in the files.

     -z      For regular files compare file sizes first, and fail the comparison if they are not equal.

     The optional arguments skip1 and skip2 are the byte offsets from the beginning of file1 and file2, respectively, where the comparison will
     begin.  The offset is decimal by default, but may be expressed as a hexadecimal or octal value by preceding it with a leading ``0x'' or
     ``0''.

EXIT STATUS

     The cmp utility exits with one of the following values:

     0	   The files are identical.

     1	   The files are different; this includes the case where one file is identical to the first part of the other.	In the latter case, if the
	   -s option has not been specified, cmp writes to standard error that EOF was reached in the shorter file (before any differences were
	   found).

     >1    An error occurred.

SEE ALSO

     diff(1), diff3(1)

STANDARDS

     The cmp utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.  The -h, -x, and -z options are extensions to the standard.

HISTORY

     A cmp command appeared in Version 1 AT&T UNIX.

BSD
								 November 18, 2013							       BSD
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