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 are prefix dereferencer and list them out?

1015

---

what are the two ways to get private values inside a subroutine or block?

913

---

What does the qq{ } operator do?

935

---

How would you ensure the re-use and maximum readability of your perl code?

922

---

Differentiate between use and require, my and local, for and foreach and exec and system

887

---

Explain use of ‘my’ keyword in perl?

924

---

How to get help for perl?

967

---

What is the use of -n and -p options?

1026

---

What is the use of -t?

945

---

How do I replace every TAB character in a file with a comma?

950

---

What are perl strings?

876

---

What is the tk module?

942

---

What does `$result = f() .. g()' really return?

1170

---

Explain the difference between die and exit in perl?

858

---

What are the different types of perl operators?

1050

---