It is difficult to answer the question without knowing "what" you want to trim.

A common command would be 'cut' to cut out columns you don't want.

PS -e|cut -d " " -fname|wc -l

Assuming that the file you are looking at is a columnar file you can use the 'cut' command, as in 'cut -c1-2 filename'

UUCP is the abbriviation of Unix to Unix copy. It is worldwide email system called UUCP or Unix to Unix copy.This email system was developed for the operating system called Unix.

No, but Linux is based on Unix since Linux is a Unix clone.