Question

I have a file with data like below:

4  1
7  12
2  5
4  4
6  67
12  5

through command line i can split each and every line into an array like below:

perl -F'\s+' -ane 'print $F[0]' file

thus will print all the first fields.
Now the above command transforms every line into an array.
in a similar way can this be done line creating a hash with keys as the first field and values for each key is the second field.?

Answer 1

Try this:

perl -MData::Dumper -ane '$X{$F[0]}=$F[1]}{print Dumper \%X' file