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Another method that reads the data in paragraph mode, splits into first element and remaining elements within lines in one map then swaps the first elements of the two lines and rejoins things up in a second, finally joining the pairs of lines into paragraphs again.

$ perl -Mstrict -Mwarnings -E ' > open my $fh, q{<}, \ <<EOF or die $!; > jay 21 34 56 > bob 12 39 > > jay 11 10 > bob 14 > > jay 190 > bob 13 > EOF > > say join qq{\n\n}, do { > local $/ = q{}; > map { > ( $_->[ 0 ]->[ 0 ], $_->[ 1 ]->[ 0 ] ) > = > ( $_->[ 1 ]->[ 0 ], $_->[ 0 ]->[ 0 ] ); > join qq{\n}, map { join q{ }, @$_ } @$_; > } > map { > chomp; > [ map { [ split m{\s}, $_, 2 ] } split m{\n} ]; > } > <$fh>; > };' bob 21 34 56 jay 12 39 bob 11 10 jay 14 bob 190 jay 13 $

I hope this is of interest.

Cheers,

JohnGG


In reply to Re: Swapping names of list while keeping the contents as it is. by johngg
in thread Swapping names of list while keeping the contents as it is. by zing

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