shell条件判断语句

语法1(一个条件):

ifcondition

then

    command1

    command2

    ...

fi

语法2(两个条件):

ifcondition

then

   command1

    command2

    ...

else

   command

fi

if condition1

then

    command1

elif condition2

then

    command2

else

    commandN

fi

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