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Full Discussion: compare files in two directories and output changed files to third directory
Top Forums Shell Programming and Scripting compare files in two directories and output changed files to third directory Post 302319986 by JerryHone on Tuesday 26th of May 2009 06:40:13 PM
Old 05-26-2009
Similar to edgarvm's but coping with new files as well as different ones...

Code:
new=/dist
old=/dist_old
diff=/dist_upgrade

cd $new
for f in *f
do
# Diff the files - ignore the output...
    diff $f $old > /dev/null 2>&1
# ...but get the status
    status=$?
    if [ $status -eq 0 ] ; then
# Files are identical - don't copy the file
        echo $f unchanged
    elif [ $status -eq 1 ] ; then
# Files differ - copy new file
        echo $f changed
        cp $f $diff
    elif [ $status -eq 2 ] ; then
# Old file doesn't exist - copy new file
        echo old $f does not exist
        cp $f $diff
    fi
done

You'll actually get a status 2 if a file exists but is unreadable as well, but I've ignored that as you can make everything readable before you start!
This User Gave Thanks to JerryHone For This Post:
ramaraobvs
 

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LEARN ABOUT MINIX

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 file1 is specified, it is compared to the uncompressed contents of file1.gz.  If two files are specified, their  con-
       tents  (uncompressed  if  necessary)  are  fed to cmp or diff.  The input files are not modified.  The exit status from cmp or diff is pre-
       served.

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 may refer to file names such as "-" instead of to the file names specified.

                                                                                                                                          ZDIFF(1)
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