#! perl -slw use strict; # Read the file, split into fields, discard the first 2 # join fields 2/3 as required for output. my @data = map{ join '/', (split ' ')[2,3] } ; my @lines; # Array in which to accumulate the output. # build each output line for my $line ( 0 .. 2 ) { # 0 .. 89 in your app # by steping through the input and appending every nth element to the output for my $col ( 0 .. 33 ) { # 0 .. 300 in your app $lines[ $line ] .= $data[ $line * 34 + $col ] . ' '; } } # display the output. print for @lines; #### __DATA__ 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P015 A G 000217 P016 A G 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P015 A G 000217 P016 A G 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P015 A G 000217 P016 A G 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P015 A G 000217 P016 A G 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P015 A G 000217 P016 A G 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P015 A G 000217 P016 A G 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P015 A G 000217 P016 A G 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P015 A G 000217 P016 A G 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A 000217 P015 A G 000217 P016 A G 000217 P008 N N 000217 P009 G G 000217 P010 A A 000217 P011 A G 000217 P012 A A 000217 P013 A G 000217 P014 A A #### P:\test>junk N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A