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quoting

$single = 'camel';
$double = "the word is $single\n";
		 # the word is camel
$back   = `pwd`; # current working dir

testing

if ($city eq 'Utrecht') {
    print "I know where I am\n";
}
else {
    print "I think I'm lost\n";
}

unless ($city eq 'Utrecht') {
    print "I think I'm lost\n";
}


file tests like a shell: -e, -x, -d, ...

(-e '/usr/bin/perl') or
    warn "Perl not installed!\n";


test statements

($word = 'camel') or
    die "out of memory...\n";

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