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<WRAP bigger fgred>Lab46 Tutorials</WRAP>
<WRAP muchbigger>Perl</WRAP>
Programing Language
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created in 1987 as a UNIX scripting language Perl has influences from c/c++, sed and unix shell scripting. It is now a full featured high-level programing language that makes text manipulation simple. Perl is also used in dynamic web page creation and report generation. understanding of UNIX shell commands and regular expressions are essential to take full advantage of the Perl language.  

===== First Program =====
<code perl>
    #!/usr/bin/perl
    
    print "hello world!";
</code>

save as hello.pl

run 
<cli>
perl hello.pl
</cli>
===== Common Commands =====
==Data Types==
  * $ - scalar variable
  * @ - array variable
  * % - hash
  * & - subroutine
==Input, Output, Comments==  
  * # - comment
  * print - print to the screen 
  * <STDIN> - grab input from the user
  * chomp - remove newline character
==Arithmetic Operators== 
  * + - add
  * * - multiply
  * % - modulus
  * ** - exponent
  * . - concatenate
  * x - repeat
  * = - assignment operator
==Logical Operators==
  *&& or and - and
  *|| or or - or
  *! or not - not
  *== or eq - equal
  *!= or ne - not equal
  *< or lt - less than
  *> or gt - greater than
  *<= or le - less than or equal too
  *>= or ge - greater than or equal too
  *<=> or cpm - compare 
==If Structure==
<code perl>
if ($var > 0)
    {
    print "something";
    }
else
    {
    print "something else";
    }
</code>
==For Loop==
<code perl>
for ($var = 0; $var < 10; $var++)
    {
    print "this is a loop";
    }
</code>

===== Input output program =====
<code perl>
#!/usr/bin/perl

my $name;
my $num;

print "What is your name: ";
$name = <STDIN>;
chomp($name);
for ($num = 0; < 10; $num++)
    {
        print $num." ";
        print "Hello, $name\n";
    }


</code>
===== Links =====
  *www.perl.org