Quote

read FILEHANDLE,SCALAR,LENGTH,OFFSET
read FILEHANDLE,SCALAR,LENGTH
[...]
An OFFSET may be specified to place the read data at some place in the string other
than the beginning. A negative OFFSET specifies placement at that many characters
counting backwards from the end of the string. A positive OFFSET greater than the
length of SCALAR results in the string being padded to the required size with "\0"
bytes before the result of the read is appended.

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$ perl -wE'
my $buffer = "abcdefghijklmno";
read STDIN, $buffer, 3, 5;
say $buffer;
'
1234567890
abcde123

Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live. -- Damian Conway in "Perl Best Practices"
lesen: Wie frage ich & perlintro brian's Leitfaden für jedes Perl-Problem