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Full Discussion: How to check the duplicancy of file using shell script?
Top Forums Shell Programming and Scripting How to check the duplicancy of file using shell script? Post 302927311 by junior-helper on Tuesday 2nd of December 2014 04:30:23 AM
Old 12-02-2014
If those files are in a dedicated directory, I mean if there are no files other than the files you want to compare, try this
Code:
ls -t | head -n2 | paste - - | xargs diff -q

If there is no output, the files are the same.

If there are other files in the same directory, you would need to change ls to something like ls -t 20*_file.txt or the like.

In a script, the above approach could be something like
Code:
if ! ls -t | head -n2 | paste - - | xargs diff -q >/dev/null
then
    echo "Files differ"
else
    echo "Files are the same"
fi

These 2 Users Gave Thanks to junior-helper For This Post:
hemanthsaikumar rbatte1
 

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LEARN ABOUT DEBIAN

zdiff

ZDIFF(1)						      General Commands Manual							  ZDIFF(1)

NAME

       zcmp, zdiff - compare compressed files

SYNOPSIS

       zcmp [ cmp_options ] file1 [ file2 ]
       zdiff [ diff_options ] file1 [ file2 ]

DESCRIPTION

       Zcmp  and  zdiff are used to invoke the cmp or the diff program on files compressed via gzip.  All options specified are passed directly to
       cmp or diff.  If only one file is specified, then it is compared to a file with the same name without the .gz extension. If two	files  are
       specified, then they are uncompressed if necessary and fed to cmp or diff.  The exit status from cmp or diff is preserved.

       When  both files must be uncompressed before comparison, the second is uncompressed to /tmp.  In all other cases, zdiff and zcmp use only a
       pipe.

SEE ALSO

       cmp(1), diff(1), zmore(1), zgrep(1), znew(1), zforce(1), gzip(1), gzexe(1)

BUGS

       Messages from the cmp or diff programs refer to temporary filenames instead of those specified.

																	  ZDIFF(1)
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