Append date to filename in linux

Question

I want add the date next to a filename (\"somefile.txt\"). For example: somefile_25-11-2009.txt or somefile_25Nov2009.txt or anything to that effect

Maybe a script w

Answer 1

a bit more convoluted solution that fully matches your spec

echo `expr $FILENAME : '\(.*\)\.[^.]*'`_`date +%d-%m-%y`.`expr $FILENAME : '.*\.\([^.]*\)'`

where first 'expr' extracts file name without extension, second 'expr' extracts extension