7.2 Looking if something is true or false
Sometimes you might want to only check if something is true or false.
In computer programs 0 always stands for false and 1 for true.
You can do if {$one == 1} { <body> }, but there
also is an other way to do the same thing.
To see if something is true you can also simply do if {$one}
{ <body> } and instead of if {$one == 0} { <body>
} you can do if {!$one} { <body> }. You can
replace the string with a command or anything else.
Inputting only one <action> in the if command
without a <compare method> makes it check if it is true.
By adding the ! in front of the <action> without giving
a <compare method> or a second <action> it checks
if it is false.
Note that in this case 'true' equals any number above 0, not
just 1.
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