this line can not set #!/bin/sh XD

===

#!/bin/sh
st1=`sudo fastboot devices`
if [ -z "$st1" ]; then
    echo "no device"
    exit 1
fi


===

#!/bin/sh
aaa="111"
bbb="111"
if [ "$aaa" = "$bbb" ] # space is must
then
    echo ok
else
    echo ng
fi

===

#!/bin/sh
aaa="111"
bbb="111"
if [ -f "/etc/rc.local" ] # space is must
then
    echo ok
else
    echo ng
fi