Tutorial

Perl for Generation of HTML

Scalar Operators

Comparison Operators

Numeric test

==

Equal to

!=

Not equal to

>

Greater than

>=

Greater than or equal to

<

Less than

<=

Less than or equal to

<=>

Not equal to with signed return

String test

eq

Equal to

ne

Not equal to

gt

Greater than

ge

Greater than or equal to

lt

Less than

le

Less than or equal to

cmp

Not equal to with signed return

Pattern Matching

$a =~ /pat/

Match

$a =~ s/p/r/

Substitution

$a =~ tr/p/r/

Translation

Logical Operators

$a && $b

And

$a || $b

Or

! $a

Not

Arithmetic Operators

$a + $b

Add

$a - $b

Subtract

$a * $b

Multiply

$a / $b

Divide

$a % $b

Modulus

$a ** $b

Exponentiate

$a++ , ++$a

Autoincrement

$a-- , --$a

Autodecrement

String Operators

$a . $b

Concatenation

$a x $b

Repeat

substr($a,$o,$l)

Substring

index($a,$b)

Index

Assignment Operators

$a = $b

Assign

$a += $b

Add to

$a -= $b

Subtract from

$a .= $b

Append

File Operators

-r $a

Readable

-w $a

Writable

-d $a

Directory

-f $a

Regular file

-T $a

Text file