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Hi my fasta file looks like:





There is no space between lines. I want to add 'aaaa' to the beginning of the sequences (i.e., abcdef and bcdef in the example). I used the following script but it gives me a connected long sequence. Can anyone help me identify the problem? Thanks XF

use warnings; use strict; my $read_mid1 = 'Reads.fna'; my $read_mid1_correct = 'Reads_correct.fa'; open ( my $input_fh, "<", $read_mid1 ); open ( my $output_fh, ">", $read_mid1_correct); while (my $line = <$input_fh> ) { unless ($line =~ /^>/) { $line =~ s/^/ACGAGTGCGT/; print $output_fh $line; } } close ( $input_fh ); close ( $output_fh );

In reply to add letters to the begin of the sentence by intect

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