the thing i'am looking for is that it is sorted by item 5 and writes back to the file
with an extra line if item 5 is different
A variation on the Swartzian transform: (read from bottom up)
#!/usr/bin/perl
use strict; use warnings;
print map { $_->[1] . "\n" }
sort {$a->[0] cmp $b->[0]}
map { chomp; [(split /\t/, $_)[4], $_] }
<DATA>;__DATA__ one title state name code1 number two title2 state2 name2 code2 number2 one title3 state3 name3 code3 number3 four title4 state4 name4 code4 number4 six title5 state5 name5 code1 number5 dip title6 state6 name6 code1 number6 fun title7 state7 name7 code2 number7
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