Yes:

1. Always use strictures (use strict; use warnings; - see The strictures, according to Seuss).
2. Always use the three parameter version of open.
3. Use lexical file handles: open my $in, '<', ...
4. Indent controlled blocks (the body of the while loop in the sample code).
5. Printing to a file you are actively reading from without an intervening seek is a bug.

Consider:

use strict;
use warnings;

my $testFileName = 'testFile.txt';
my $tempFileName = 'delme.txt';

# Create a sample file
open my $out, '>', $testFileName or die "Failed to create $testFileNam
+e: $!";

print $out <<END_STR;
be_address = remote_be_address
be_address1 = remote_be_address
be_address2 = remote_be_address
END_STR

close $out;

# The 'meat'
open my $in, '<', $testFileName;
open $out, '>', $tempFileName or die "Failed to create $tempFileName: 
+$!";

while (<$in>) {
    s/remote_be_address/192.168.106.60/g;
    print $out $_;
}

close $in or die "Failed to close $testFileName: $!";
close $out or die "Failed to close $tempFileName: $!";

unlink $testFileName;
rename $tempFileName, $testFileName;

# Show the result
open $in, '<', $testFileName;
print <$in>;
close $in or die "Failed to close $testFileName: $!";
[download]

Prints:

be_address = 192.168.106.60
be_address1 = 192.168.106.60
be_address2 = 192.168.106.60
[download]

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