shell

在dos命令行窗口启动mysql服务：net start mysql

 //除去空格

a=`echo $a |sed -e 's/ //g'

echo $a

if [ "$a" != " dsds" ];then

 echo "ddddddddddddddddddddd"

else

 echo "ffffffffffffffffff"

fi

 

理解：if后面只需要一个true 或者false的表达式

if test "a" = "a" -a  "aa"="aa" ;then

  echo "dd*****************************ddddddddddddddddddd"

else

  echo "gggggggggggggg"

fi