Simple search

 [convert rows to columns] convert rows to columns -> convert rows to columns, whoops :)

 [conv row column] conv row column -> converting rows into column, How to convert a row structured text file into a column structed text file, Converting Column Into Row, how do i convert text file into a table having fixed columns and different rows

So perlintro, split, unpack, m//atch... The Perl Monks Guide to the Monastery

Don't forget to search