Files and Safe IO

Build Output Text

Before writing data, a program can build the exact output text it intends to store.

Build Output Text

scalar_write.pl 
use strict;
use warnings;

my $word = ;
my $buffer = "";

$buffer = $buffer . "status=$word\n";
chomp $buffer;

print "word=$word\n";
print "buffer=$buffer\n";

use strict;
use warnings;

my $word = ;
my $buffer = "";

$buffer = $buffer . "status=$word\n";
chomp $buffer;

print "word=$word\n";
print "buffer=$buffer\n";

use strict;
use warnings;

my $word = ;
my $buffer = "";

$buffer = $buffer . "status=$word\n";
chomp $buffer;

print "word=$word\n";
print "buffer=$buffer\n";
output buffer An output buffer is a string that collects text before it is written somewhere.