https://bioinformaticsonline.com/snippets/view/43558/perl-onliner-to-check-the-ids-in-two-files? https://bioinformaticsonline.com/snippets/view/43558/perl-onliner-to-check-the-ids-in-two-files Thu, 21 Oct 2021 07:21:10 -0500 https://bioinformaticsonline.com/snippets/view/43558/perl-onliner-to-check-the-ids-in-two-files perl -lane 'BEGIN{open(A,"ids2.txt"); while(<A>){chomp; $k{$_}++}} if (defined($k{$F[0]})) {print "$_\t$F[0]\t1"} else {print "$_\tNA\t0"}; ' ids1.txt > aaa.xls]]> Surabhi Chaudhary