Three lines tip

Do you have a tip/hack that's max. three lines long??

Removing whitespaces from filename

 # i in *.[jJ][pP][gG]; do mv "$i" $(echo "$i" | sed "s/ /_/g"); done

ali

 # rename 's/ /_/' *.[jJ][pP][gG]

:)

How to get Webserver Version

 # printf "HEAD / HTTP/1.0nn" | nc $server 80 | grep Server