Search & replace with find & ed

Tuesday, 23 March 2010 22:21



function sr() {



   declare pattern replacement name usage

   declare -i pvar=0 rvar=0 tvar=0



   usage='usage: sr [-t ] [-n name] [-p pattern] [-r replacement] [-- ] [dir1 dir2 ...]'



   # cf. http://bsdpants.blogspot.com/2007/02/option-ize-your-shell-scripts.html



   while [[ "${1:0:1}" == '-' ]] ; do



      [[ "${1}" == '--' ]] && { shift; break; }      # -- marks end of options 



      [[ ${#1} -ne 2 ]] && { echo "${usage}"; return 1; }



      case "${1:1:1}" in

         'n') name="${2}"

              shift 2 ;;

         'p') pattern="${2}"

              pvar=1

              shift 2 ;;

         'r') replacement="${2}"

              rvar=1

              shift 2 ;;

         't') tvar=1

              shift ;;

           *) echo "${usage}"

              return 1 ;;

      esac



   done



   if [[ $pvar -eq 0 ]] || [[ $rvar -eq 0 ]]; then

      echo 'Both options -p and -r must be specified!'

      echo "${usage}"

      return 1

   fi





while read -d $'\0' fpath; do 



   if [[ -z "$(/usr/bin/egrep -I -m1 '^.' "${fpath}")" ]]; then       # skip binary files

      echo "Binary file: ${fpath}"

      continue

   fi



   if [[ $tvar -eq 0 ]]; then                              # perform an actual search & replace



cat <<-EOF | /bin/ed -s "${fpath}"

H

g/${pattern}/s/${pattern}/${replacement}/g

wq

EOF



   else                                                    # only simulate a search & replace and print the result to stdout



      printf "\n\n\033[1m%s\033[m\n\n\n" "${fpath}"        # print the current file path





      # delete all lines that do not contain a pattern match: v/...

      # add a final trailing new line in case all lines got deleted: \$a...

      # do the matching: g/${pattern}/...

      # insert '#:   ' at the beginning of each line: g/./s/\(...



cat <<-EOF | /bin/ed -s "${fpath}"

H

v/${pattern}/d

\$a



.

g/${pattern}/s/${pattern}/$(printf "\033[32m${replacement}\033[m")/g

g/./s/\(.*\)/#:   \1/g

,p

EOF



   fi



done < <(/usr/bin/find -x "${@}" -type f -name "*${name}" -not -empty -print0)



}





man ed | less -p 'REGULAR EXPRESSIONS'



# test mode

sr -t -p hello -r world -n ".txt" /path/to/dir | less -r



# actual search & replace without previous backup

sr -p hello -r world -n ".txt" /path/to/dir





# backslash-escape the / character

sr  -t -p '\/usr\/local' -r '\/opt\/local' /path/to/file

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Search &amp; replace with find &amp; ed

Search & replace with find & ed