#!/bin/bash
a=2
b=3

tt=$[$a>=$b]
if [ $[0] ]
then
	echo $[0]
	echo aaaa
else
	echo $[$a<=$b]
	echo bbbb
fi

temp=false
if  $temp
then
	echo $[$a>=$b]
	echo aaaa
else
	echo $[$a<=$b]
	echo bbbb
fi

#!/bin/bash
a=12
while [ $a ]
do
    a=$[$a-1]
    echo $a
    if [ 0 ]
    then 
	echo aaaaaaaaaaaaa
    else 
	echo bbbbbbbbbbbbb
    fi
	if [ $a -eq -20 ]
	then 
	break	
	fi
done