Answer Posted / savitha sridhar

-w to enable warnings mode
-T to enable Taint mode (TAINT mode puts a Perl script
into "PARANOID" mode and treats ALL user supplied input as
tainted and bad unless the programmer explicitly "OKs" the
data). Usually used when you are using a perl script that
you have downloaded and running but do not want any
security problems.

strict is a pragma in perl used to incorporate strict
programming practices.
Eg:

you could have written a small prog like this:

$x=100;
print $x;

with strict pragma "ON" you will be explicitly required to
specify the scope like,

use strict;
my $x=100; ##use of my to specify scope
print $x;

You can also switch off a pragma by using "no" like below
to switch off the pragma effect:

use strict;
my $x=100; ##use of my to specify scope
print $x;
no strict;
$y=200; ##no need to be specific
print $y;

What does last statement do in perl?

530

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What is chomp() operator/function?

566

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What is the purpose of “_file_ literal” and “_line_ literal” in perl?

540

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How to replace perl array elements?

532

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What are the options that can be used to avoid logic errors in perl?

521

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Explain what is STDIN, STDOUT and STDERR?

546

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How we can navigate the xml documents?

536

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What is hash?

556

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How can we create perl programs in unix, windows nt, macintosh and os/2 ?

486

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What is 'commit' command in perl?

611

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Explain regular expression in perl?

532

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How can you replace the characters from a string and save the number of replacements?

514

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What do you mean by context of a subroutine?

564

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Write a program that explains the symbolic table clearly.

536

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Mention how many ways you can express string in Perl?

586

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