rename-folder.sh

#!/bin/bash
#source ~/.my_custom_commands.sh

function rename-folder() {
  for f in *.*; do
    newname=`echo "$f" | sed -E "s/$1/$2/g"`
    if [ $3 == 'do' ]
    then
      mv "$f" "$newname"
    else
      echo "$newname"
    fi
  done
}