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You can use like bellow:
(( var0 = var1<98?9:21 ))
the same as
if [ "$var1" -lt 98 ] ]; then var0=9 else var0=21 fi
extends
condition?result-if-true:result-if-false
I found the interested thing on the book "Advanced Bash-Scripting Guide"
if [ "$var1" -lt 98 ] then var0=9 else var0=21 fi
if [ "$var1" -lt 98 ]; then var0=9 else var0=21 fi
extends condition?result-if-true:result-if-false