Your code doesn't seem to cope with consecutive lines starting with a semi-colon and it gets a bit noisy running with use warnings; against an empty file. The following seems to work.

use strict;
use warnings;

my $acc;
while ( <> )
{
    chomp;
    if ( m{^;} )
    {
        $acc .= substr $_, 1;
    }
    else
    {
        print $acc, qq{\n} if defined $acc;
        $acc = $_;
    }
}
print $acc, qq{\n} if defined $acc;

[download]

I hope this is of interest.

Cheers,

JohnGG

Update: added defined to test to cope with lines that are empty. My test file is

;ddadadwaew
sddjdsoeugfuiegf
euefuefuerfefg
;erreuruyegfegr
ueyrueuefeyr7e

;
;
erieihir
eiereyrgueyrgh
;ieruherueu
;ierhueryugr
reieruyeruy

[download]

In reply to Re^2: append line to previous line in txt file by johngg
in thread append line to previous line in txt file by mmittiga17

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