shell_02

if判断:

if [$? -eq 0];then

  echo "xxxxxxxxxxx"

else

  echo "xxxxxxxxxxxxx"

fi

case判断:

case $name in

xxx)

  echo "xxxxxxx"

xxx)

  echo "xxxxxx"

esac

for循环

for i in $(seq 1-3)

  do

    echo "xxxx"

  done

while循环:

i=1

while((i<=10))

  do

    echo $i

    let i++

  done

while [1]    永久循环

  do

    echo"ssssss"

    sleep 3

  done

while [1]

  do

    read -p "xxxxx":key

    test $key = x -o $key = X

    if [$? -eq 0]

      then

        echo "xxxxxxxxxx"

        continue  继续下一个循环

        echo "xxxxxxxx"  这里不会被输出

    else

      echo $key

    fi

  done

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