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#!/usr/bin/env bash 
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# 
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# let arithmetic. 
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#### let 
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# NOTE: no spaces are allowed. How is this tokenized? 
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let x=1 
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let y=x+2 
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let z=y*3 # zsh treats this as a glob; bash doesn't 
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let z2='y*3' # both are OK with this 
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echo $x $y $z $z2 
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## stdout: 1 3 9 9 
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## OK zsh stdoutjson: "" 
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## OK zsh status: 1 
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#### let with () 
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let x=( 1 ) 
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let y=( x + 2 ) 
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let z=( y * 3 ) 
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echo $x $y $z 
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## stdout: 1 3 9 
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## status: 0 
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## NI mksh/zsh stdoutjson: "" 
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## NI mksh/zsh status: 1 