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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 OSX

opendiff

opendiff(1)						    BSD General Commands Manual 					       opendiff(1)

NAME

     opendiff -- Use FileMerge to graphically compare or merge file or directories

SYNOPSIS

     opendiff file1 file2 [-ancestor ancestorFile] [-merge mergeFile]
     opendiff dir1 dir2 [-ancestor ancestorDirectory] [-merge mergeDirectory]

DESCRIPTION

     opendiff is a command line utility that provides a convenient way to launch the FileMerge application from Terminal to graphically compare
     files or directories.  If FileMerge is already running, opendiff will connect to that running instance for the new comparison.  opendiff
     exits immediately after the comparison request has been sent to FileMerge.

     opendiff and FileMerge can be used to compare two files file1 and file2 or to compare two directories dir1 and dir2.

     If the -ancestor flag is given, FileMerge will compare the two files or directories to a common ancestor.	This is useful if two people inde-
     pendently modify copies of a single original file or directory.

     FileMerge lets you merge two files or directories together to create a third file or directory.  To see the contents of a merged file, drag
     the splitter bar at the bottom of FileMerge's file comparison window.  The contents of the merged file can be directly edited within File-
     Merge.  After editing, the merged file can be saved to the file (or into the directory) specified with the Fl merge flag.	If a destination
     is not specified with the -merge flag, FileMerge will ask for a destination file or directory when you try to save a merged file.

     For further information, please consult the Help information available from the FileMerge application.

FILES

     /Developer/Applications/Utilities/FileMerge.app

     opendiff and FileMerge are installed as part of the Mac OS X Developer Tools.

SEE ALSO

     diff(1), diff3(1), cmp(1)

Mac OS X							  August 3, 2004							  Mac OS X
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