The if statement creates the branches and switches of your Xtscript
[...] = optional ... = your value
if ...
...
[else
...]
endif
"nested if's" can be a problem in xtscript
Most of these issues can be overcome using goto
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$x is more than 50
'abcdef' is less than 'abcdeg'
$a equals 3 ?
no output because $a does not equal 3 so $b test is skipped