#!/bin/bash -  function mytest(){    echo "arg1 = $1"      if [ $1 = "1" ] ;then        return 1    else        return 0    fi}if mytest 2; then        echo "aaaaaaaaaa"fi

　　执行结果：

稍微改一下

#!/bin/bash -

function mytest()

{

　　echo "arg1 = $1"

　　if [ $1 = "1" ] ;then

　　　　return 1

　　else

　　　　return 0

　　fi

}

if mytest 1; then

　　echo "aaaaaaaaaa"

fi

 

 

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shell 中定义的变量是全局的，函数上面定义的变量在函数内部仍然是可见的

#!/bin/bash -    g_var=  function mytest2()  {      echo "mytest2"      echo "args $1"      g_var=$1        return 0  }    mytest2 1  echo "return $?"    echo  echo "g_var=$g_var"