Bash. command not found

[ megabaks@desktop ] ~ $ status=0
[ megabaks@desktop ] ~ $ if [ $status == "0" ];then echo fail;fi
fail
[ megabaks@desktop ] ~ $ if [$status == "0"];then echo fail;fi
bash: [0: команда не найдена
[ megabaks@desktop ] ~ $ 

aol@hp:~$ unset status
aol@hp:~$ if [ $status == "0" ];then echo fail;fi
bash: [: ==: unary operator expected

#!/bin/bash
while true
do
    status=`cat status.txt`
    echo $status
    if [[ $status == "0" ]]
    then
	xdotool keydown space
    elif [[ $status == "1" ]]
    then
	xdotool keyup space
    fi
    break
done