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Directory containing files,Print names of the files in the directory that are exactly same content.

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# 1  
Old 03-22-2017
Directory containing files,Print names of the files in the directory that are exactly same content.
Given a directory containing say a few thousand files,
please output a list of all the names of the files in the directory that are exactly the same, i.e. have the same contents.
Code:
func(a_directory_name) output -> {“matches”: [[fn1, fn2 ...], [fn3, fn4 ...] ... ]}

e.g. func(“/home/my/files”) where the directory /home/ca31319/files might contain foo.txt, foo.iso, foo.jpeg, bar.txt, bar.doc, baz.csv, baz.ppt etc. and say the file foo.txt is the same as bar.doc and foo.iso is the same as baz.csv and baz.ppt then the output would be:

Code:
{
"matches": [
[
"foo.txt",
"bar.doc"
],
[
"foo.iso",
"baz.csv",
“baz.ppt”
]
]
}

# 2  
Old 03-22-2017
Where exactly are stuck?
# 3  
Old 03-22-2017
I tried the below code

Code:
for i in TEST/*;
do
for a in TEST/*;
do
if [[ $i == $a ]];then
echo "============"
else
comp=`comm -3 $i $a`;
if [[ $comp != "" ]];then
echo "=============="
else
echo "Matches the $i and $a"
fi
fi
done
done

# 4  
Old 03-22-2017
You are comparing every pair twice. How about
Code:
md5sum TEST/* | 
awk '
        {CS[NR] = $1
         FN[NR] = $2
        }
END     {for (i=1; i<=NR; i++)
          for (j=i+1; j<NR; j++) if (CS[i] == CS[j]) print FN[i] "=" FN[j]
        }
'

This User Gave Thanks to RudiC For This Post:
vgersh99
# 5  
Old 03-22-2017
Another route would be to run the sum command on everything in the directory and redirect the output through sort. If the output of sum is the same for a pair (trio, etc.) of files, they should be identical.
# 6  
Old 03-22-2017
Or, in pure shell:
Code:
for i in TEST/*
     do for a in $(ls -r TEST/*)
          do    [ $i == $a ] && break
                cmp -s $i $a && echo "Matches the $i and $a"
          done
     done

Last edited by RudiC; 03-22-2017 at 07:14 PM.. Reason: wrong file patterns
This User Gave Thanks to RudiC For This Post:
anuragpgtgerman
# 7  
Old 03-23-2017
Hi.

You may also wish to consider some programs from the class of utilities that deal with the general idea of differences::
Code:
        15) fdupes, rdfind, duff, jdupes find duplicate files

Some details:
Code:
rdfind  finds duplicate files (man)
Path    : /usr/bin/rdfind
Version : 1.3.4
Type    : ELF 64-bit LSB executable, x86-64, version 1 (SYSV ...)
Help    : probably available with --help
Repo    : Debian 8.7 (jessie) 

fdupes  finds duplicate files in a given set of directories (man)
Path    : /usr/bin/fdupes
Version : 1.51
Type    : ELF 64-bit LSB executable, x86-64, version 1 (SYSV ...)
Repo    : Debian 8.7 (jessie) 

jdupes  finds and performs actions upon duplicate files (man)
Path    : ~/executable/jdupes
Version : 1.5.1 (2016-11-01)
Type    : ELF 64-bit LSB executable, x86-64, version 1 (SYSV ...)

duff    duplicate file finder (man)
Path    : /usr/bin/duff
Version : 0.5.2
Type    : ELF 64-bit LSB executable, x86-64, version 1 (SYSV ...)
Repo    : Debian 8.7 (jessie)

Best wishes ... cheers, drl
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