awk oneliner - remove all extra whitespace from file

Remove all extra whitespaces from each line of a file. Basically, a trim on both ends and all but one space between fields is removed:

awk '{ $1=$1; print }'

Yup...another very hard one to write. :-) But useful in formating. This could be combined with another awk to replace each single space between fields with a delimeter of your choice.