主程序如何向function传参？

yuhe27913

[root@MYDB ~]# more para.sh
#!/bin/bash
num=0
fun1 ()
{
echo "now we step in function.do nothing to it $num"
num=`echo "$num+1"|bc`
echo "we change its value in the function $num"
return 99
}
echo "The original value of num is $num"
num=`echo "$num+1"|bc`
echo "Then change its value in main program and make it now $num"
fun1
echo "at last,we back to main program,recheck $num"

补一个变量范围的例子

[root@MYDB ~]# bash para.sh
The original value of num is 0
Then change its value in main program and make it now 1
now we step in function.do nothing to it 1
we change its value in the function 2
at last,we back to main program,recheck 2

shell没有所谓的变量边界问题。

yuhe27913

久不写脚本，还真转不过弯来。