关于Local命令的问题

270175100

local [option] [name[=value] ...]
              For  each  argument,  a  local  variable  named  name is created, and assigned value.  The option can be any of the
              options accepted by declare.  When local is used within a function, it causes the variable name to have  a  visible
              scope  restricted  to  that function and its children.  With no operands, local writes a list of local variables to
              the standard output.  It is an error to use local when not within a function.  The return status is 0 unless  local
              is used outside a function, an invalid name is supplied, or name is a readonly variable.


abc()
{
local a=`echo $haha | awk -F , '{ print $7}'`

....
...
....
}


大家谁能帮忙翻译一下，我翻译完了看不太懂,还有上面这个代码的意思是？  $haha 这个变量就直接这样设置了？？？

alfred119

貌似变量继承的意思

blackold

上下文。

Minsic

变量在只在定义它的函数里有效：

[oracle@Minerva practice]$ cat local_variable
abc () {
local a=2
echo "in the function, a=$a"
}

a=1
echo "outside the function, a=$a"
abc
echo "outside of the function, a=$a"
[oracle@Minerva practice]$ local_variable
outside the function, a=1
in the function, a=2
outside of the function, a=1
[oracle@Minerva practice]$

wtuter

局部变量定义，