Shell Programming and Scripting

#!/bin/bash
#
# setup folders for our different stages
#
Dir1=/Users/username/source1
Dir2=/Users/username/source2
Dir3=/Users/username/target
#
cd $Dir1
for f in *f
do
# Diff the files - ignore the output...
    diff $f $Dir2 > /dev/null 2>&1
# ...but get the status
    status=$?
    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

#!/bin/bash

for file_1 in $( find DIR_1/* -type f | sed 's/\.\.\///g' )             # For each file in DIR_1
do
        file_2=$( echo $file_1 | sed 's/DIR_1/DIR_2/g' )                # Getting file path in DIR_2
        dir_2=$( dirname $file_2 )

        if [ ! -d $dir_2 ]                                              # Checking if sub-dir exists in DIR_2
        then
                echo -e "Dir: $dir_2 does not exist. Creating...\c"
                mkdir -p $dir_2                                         # Creating if sub-dir missing
                echo "Done"
        fi

        if [ -f $file_2 ]                                               # Checking if file exists in DIR_2
        then
                cksum_file_1=$( cksum $file_1 | cut -f 1 -d " " )       # Get cksum of file in DIR_1
                cksum_file_2=$( cksum $file_2 | cut -f 1 -d " " )       # Get cksum of file in DIR_2

                if [ $cksum_file_1 -ne $cksum_file_2 ]                  # Check if cksum matches
                then
                        echo -e "File: $file_1 is modified. Copying..\c"
                        cp $file_1 $file_2                              # Copy if cksum mismatch
                        echo "Done"
                fi
        else
                echo -e "File: $file_2 does not exist. Copying...\c"
                cp $file_1 $file_2                                      # Copy if file does not exist.
                echo "Done"
        fi
done

#!/bin/csh
setenv Dir1 "path1"
setenv Dir2 "path2"
setenv Dir3 "path3"
rsync -Havx --dry-run "$Dir1" "$Dir2" > /tmp/differences
foreach "element" ( 'cat /tmp/differences' )
            cp -rpf "$element" "$Dir3"
end
exit