Tr

Tr is a little linux utility which translates standard input and returns in standard output. It is useful for easily converting from uppercase to lowercase, etc...

Examples

>for i in `find | grep Nomfich`; do j=`echo $i | tr [Nom] [nom]`; if [ $i != $j ]; then mv $i $j; fi; done;

This bash line transforms the Nomfich_*.dat files into nomfich_*.dat

> cat somefile.txt | tr -cd [:graph:]

This line deletes all non-printable characters (good for chomping a string...)