http://stackoverflow.com/questions/1224766/how-do-i-rename-the-extension-of-a-batch-of-files
rename .cc .c *.cc
find . ! -name *.tgz -delete
http://forums.devshed.com/unix-help-35/list-date-with-seconds-from-ls-command-49800.html
ls –time-style=full-iso -l