shell腳本報錯："[: =: unary operator expected"

pid=`ps -ef|grep deploy|egrep -v 'grep'|awk -F '[ ]+' '{print $3}'`
if [ $pid -ne 0 ]
then
kill $pid

fi

 

上面腳本執行報錯"[: =: unary operator expected"
須要把[ $pid -ne 0 ] 改成"[[ $pid -ne 0 ]]"便可