convert hard-links to symbolic links

ln-conv-hl

#!/bin/bash
#
# converts hard-links to symbolic links
#
#-------------- Author:  -------------#
# by Ruben Barkow
# git: https://gist.github.com/7a9a83695a28412abbcd.git

#--- Copyright and license -----------#
#This code is covered by the GNU General Public License 3.

#default: no dry-run
DRY=false

# Execute getopt on the arguments passed to this program, identified by the special character $@
PARSED_OPTIONS=$(getopt -n "$0"  -o hn --long "help,dry-run"  -- "$@")

#Bad arguments, something has gone wrong with the getopt command.
if [ $? -ne 0 ]; then
  exit 1
fi

# A little magic, necessary when using getopt.
eval set -- "$PARSED_OPTIONS"

# Now go through all options with a case and using shift to analyse one argument at a time.
# $1 identifies the first argument, and when we use shift we discard the first argument, 
# so $2 becomes $1 and goes again through the case.
while true; do
  case "$1" in

    -h|--help)
      echo "  This script converts all hard-links into symbolic links that it finds in a 
  relative source directory from working directory (first argument) that are the
  same as in the working directory (optional second argument, default \"./\" )
  
  NAME:

    ln-conv-hl

  DESCRIPTION:

    this script converts hard-links into symbolic links

  GLOBAL OPTIONS:
    
    Mandatory arguments to long options are mandatory for short options too.
    
    -n, --dry-run
        the output only shows what will be done
    -h, --help 
        Display this help documentation
    $1 (first argument)
        soure directory wherein to search for another file with the same inode
    $2 (second argument)
        directory where to replace all hard-links in
    
  USAGE EXAMPLES:
      
    # dry-run for converting all hard-links inside /etc/apache2/sites-enabled into sympolic links
    ln-conv-hl /etc/apache2/sites-available /etc/apache2/sites-enabled -n
    
  DEVELOPER INFO
  
    This project on git:       https://gist.github.com/7a9a83695a28412abbcd.git
"
      exit
      shift;;

    -n)
      # dry-run
      DRY=true
      shift;;

    --)
      shift
      break;;
  esac
done

if [ $# -eq 0 -o $# -ge 3 ]; then
  echo ERROR: this script has to be called with 2 arguments
  echo
  exec "$0" -h 
fi

if [ $# -eq 1 ]; then
  echo "No working directory defined - use `pwd` as working directory"
  WORKING_DIR="."
else
  WORKING_DIR=$2
fi
SOURCE_DIR=$1
echo relative source directory from working directory: $SOURCE_DIR
echo working directory: $WORKING_DIR

if [ $DRY == true ]; then 
  echo "dry-run: $DRY"
fi
# find all files in WORKING_DIR
cd "$WORKING_DIR"
find "." -type f -links +1 -printf "%i %p\n" | while read working_inode working_on
do
  find "$SOURCE_DIR" -type f -links +1 -printf "%i %p\n" | sort -nk1 | while read inode file
  do
    if [[ $inode == $working_inode ]]
    then
      echo -n ln -vsf '"'$file'" "'$working_on'"'
      if [ $DRY == true ]; then 
      echo " # nothing done"
      else 
      echo " # executing..."
      ln -vsf "$file" "$working_on"
      fi
    fi
  done
done

The help statement should probably use a heredoc to avoid the quoting issues, and should look more like "echo -- <<ENDOFHELP" so as to avoid potential issues with different echo implementations which might interpret, for example, the "-n" in the string.

The argument count check on line 81 should use "-ge" to catch all values outside of the accepted range.

The shift on line 68 is a no-op. :)

@dannysauer: about line 68 and 81, like this? https://gist.github.com/rubo77/7a9a83695a28412abbcd/revisions

And what do you mean with "echo -- <<ENDOFHELP"?