A simple script for renaming files using a sed regular expression pattern

pattern_rename.bash

#!/usr/bin/env bash
#
#  Usage:
#    pattern_rename "SED_PATTERN" "FILE_GLOB"
#
#  Example:
#    pattern_rename.bash 's/^Youtube - //' "*"
#
#  Don't forget to put your file glob in quotes.

PATTERN=$1
FILE_GLOB=$2

# Using -n to avoid clobbering your existing files
RENAME_COMMAND="mv -n"

for SOURCE_FILE in ${FILE_GLOB}; do
  if [ -e "${SOURCE_FILE}" ]; then
    TARGET_FILE=$(echo ${SOURCE_FILE} | sed "${PATTERN}")
    ${RENAME_COMMAND} "${SOURCE_FILE}" "${TARGET_FILE}"
  fi
done