in reply to Perl/Shell certification

If you want to pass some certification test in view of getting hired, you better check what kind of certification will be acceptable to your future employer. Personally I would never hire someone only on the strength of a certificate issued by some commercial organisation who stands to gain more by selling certificates than by being strict.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James