[Bash] Check and backup files in two different folders

#!/bin/bash # to check whether the target folder contains same files as the source folder #     with an option to back the file not existing in target folder. #     More actions could be done for the modified ones in the future #     Also nothing is done to sub-folders so far. # Usage: #    CheckDiff.sh -s source_folder -t target_folder -type filetype -copy # e.g., #    CheckDiff.sh -s /mnt/mywork/mfiles -t /mnt/mybackup/mfiles -type m -copy # Update: #            oct 25, 2011: #                                  consider file name with space #                                  copy sub-folders if not exist #                                  add debug option to show the filenames [-debug] #                                  add option to check inside of existing sub-folders [-sub] #            oct 26, 2011: #                                 automatically creating sub-folders if filetype is specified #                                 test-mode [-test] #                                 redirect the error msgs [2< /dev/null]  #                     Future:  #                                check modified date to handle modified files #                                Simple GUI                 #copyright @ http://scriptdemo.blogspot.com isSource=0 isTarget=0 isFiletype=0 isCopy=0 isDebug=0 isSubFolder=0 isTest=0 optstr="" while [ $# -gt 0 ]; do      case $1 in        -t|-target)          [ ! -d $2 ] && echo " target folder: $2 does not exist" && exit          isTarget=1          tFolder=`echo $2 | sed 's/\/$//'`          shift;shift;          ;;        -s|-source)          [ ! -d $2 ] && echo " source folder: $2 does not exist" && exit          isSource=1          sFolder=`echo $2 | sed 's/\/$//'`          shift;shift;          ;;        -filetype|-type)          isFiletype=1          filetype=$2          optstr="${optstr} -filetype ${filetype}"          shift;shift;          ;;        -copy|-COPY|-cp)          isCopy=1          optstr="${optstr} -cp"          shift          ;;        -d|-debug|-D)          isDebug=1          optstr="${optstr} -debug"          shift          ;;        -sub|-all|-subfolder|-deeper)          isSubFolder=1          optstr="${optstr} -sub"          shift          ;;        -test|-TEST)          isTest=1          optstr="${optstr} -test"          shift          ;;        *)         echo "unkown option: $1"         shift         ;;     esac done if [ ${isSource} -eq 0 ] && [ ${isTarget} -eq 0 ]; then    echo "Usage: CheckDiff.sh -s source_folder -type filetype -t target_folder [-copy]"    exit fi if [ ${isSource} -eq 0 ] && [ ${isTarget} -eq 1 ]; then    sFolder=${PWD}    echo "--------------------------------------------"    echo "| source folder is set to current folder: $PWD"    echo "--------------------------------------------" fi if [ ${isSource} -eq 1 ] && [ ${isTarget} -eq 0 ]; then    tFolder=${PWD}    echo "--------------------------------------------"    echo "| target folder is set to current folder: $PWD"    echo "--------------------------------------------" fi if [ ${isFiletype} -eq 0 ]; then    filetype='*' else    filetype0=`echo ${filetype} | sed -e 's/^\*\.//'`    filetype="*.${filetype0}"; unset filetype0 fi if [ ${isSubFolder} -eq 1 ]; then    if [ ${filetype} != '*' ]; then       eval "folderLev0=( `ls -d ${sFolder}/*/ 2< /dev/null | awk -F/ '{print $(NF-1)}'` )"       eval "fileLev0=( `ls ${sFolder}/${filetype} 2< /dev/null | awk -F/ '{print $NF}'` )"       eval "mylist=( ${folderLev0[*]} ${fileLev0[*]} )" && unset foldeLev0 fileLev0    else       eval "mylist=( `ls ${sFolder}/ 2< /dev/null ` )"       isFiletype=0    fi else    if [ ${filetype} != '*' ]; then       eval "mylist=( `ls ${sFolder}/${filetype} 2< /dev/null | awk -F/ '{print $NF}'` )"    else       eval "mylist=( `ls ${sFolder}/ 2< /dev/null` )"       isFiletype=0    fi fi if [ ${#mylist} -gt 0 ]; then    [ ${isDebug} -eq 1 ] && echo -e "\nmylist: \n ${mylist[*]}\n"    for fln in ${mylist[*]}    do       fname="${sFolder}/${fln}"       [ ${isDebug} -eq 1 ] && echo "fname=${fname}"       if [ -d "${fname}" ]; then          if [ ! -d "${tFolder}/${fln}" ]; then             echo "${fln} does not exist in ${tFolder}"             if [ ${isCopy} -eq 1 ]; then                if [ ${isFiletype} -eq 1 ]; then                   echo " |- creating ${tFolder}/${fln}..........."                   if [ ${isTest} -eq 1 ]; then                      echo " |- mkdir -p ${tFolder}/${fln}"                      echo " |- digging deeper into ${sFolder}/${fln}........"                      echo " |- CheckDiff.sh -s ${sFolder}/"${fln}" -t ${tFolder}/"${fln}" ${optstr}"                      echo " "                   else                      eval "mkdir -p ${tFolder}/${fln}"                      [ ${isDebug} -eq 1 ] && echo " |- digging deeper into ${sFolder}/${fln}........"                      [ ${isDebug} -eq 1 ] && echo -e " |- CheckDiff.sh -s ${sFolder}/"${fln}" -t ${tFolder}/"${fln}" ${optstr}"                      eval CheckDiff.sh -s ${sFolder}/"${fln}" -t ${tFolder}/"${fln}" ${optstr}                    fi                else                   echo " copying whole folder..........."                   if [ ${isTest} -eq 1 ]; then                      echo "cp -r ${fname} ${tFolder}"                   else                      eval "cp -r "${fname}" ${tFolder}"                   fi                fi             else                echo "OMIT: ${fname} is a folder...."             fi          else             if [ ${isSubFolder} -eq 0 ]; then                echo "OMIT: ${fln} is a folder...."             else                [ ${isDebug} -eq 1 ] && echo " digging deeper into ${sFolder}/${fln}........"                if [ ${isFiletype} -eq 1 ]; then                   [ ${isDebug} -eq 1 ] && echo -e " |- CheckDiff.sh -s ${sFolder}/${fln} -t ${tFolder}/${fln} ${optstr}\n"                   eval "CheckDiff.sh -s ${sFolder}/"${fln}" -t ${tFolder}/"${fln}" ${optstr}"                else                   [ ${isDebug} -eq 1 ] && echo -e " |- CheckDiff.sh -s ${sFolder}/${fln} -t ${tFolder}/${fln} ${optstr}\n"                   eval "CheckDiff.sh -s ${sFolder}/"${fln}" -t ${tFolder}/"${fln}" ${optstr}"                fi             fi          fi       else          if [ -e ${tFolder}/"${fln}" ]; then             isDiff=`diff -bB "${tFolder}/${fln}" "${tFolder}/${fln}"`             if [ ${#isDiff} -gt 0 ]; then                echo "DIFF: $fln is modified."                #consider to make a new copy             fi          else             if [ ${isCopy} -eq 0 ]; then                echo "COPY: ${fln} does not exist in ${tFolder}"             else                echo -e "ALERT: ${fln} does not exist in ${tFolder} --copying....."                if [ ${isTest} -eq 1 ]; then                   echo "cp "${fname}" ${tFolder}"                else                   eval "cp "${fname}" ${tFolder}"                fi             fi          fi       fi    done fi