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example if then else loop
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.control
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foreach val -40 -20 0 20 40
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if $val < 0
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echo variable $val is less than 0
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else
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echo variable $val is greater than or equal to 0
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end
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end
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let vec = 1
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if vec = 1 ; $&vec = 1 is possible as well
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echo vec is $&vec
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end
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.endc
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.end
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