Changing extensions and files to lowecase!!

change extensions from .abc to .123, use one of the following:

for i in *.abc; do mv $i `echo $i|sed 's/.abc$/.123$/'`; done # ©2007 dsplabs.com.au
for i in *; do mv $i `basename $i .abc`.123; done # ©2007 dsplabs.com.au

The following bash one-liners convert filenames to lowercase:

for f in `find *`; do mv "$f" "`echo "$f" | tr A-Z a-z`"; done # ©2007 dsplabs.com.au
for f in `find . -type f -name "*[A-Z]*"`; do mv "$f" "`echo "$f" | tr A-Z a-z`"; done # ©2007 dsplabs.com.au