Renaming files in one line

gistfile1.sh

# Rename files in one line
# Util for renaming files with prefix or sufix, removing, modifying, etc

# First, list files that will be renamed
# In sequence, create the command to rename it (using mv command)
# Modify the command swapping the string
# Send it to /bin/bash

ls *_abc.png | awk '{print("mv "$1" "$1)}' | sed 's/_abc/_def/2' | /bin/bash

# Credits: http://hints.macworld.com/article.php?story=20010509130450691