shell script day07- function

   Function: Write code faster to repeated calls

A function of writing formats

　1.　function check_cpu {

　　　　CAT / proc / cpuinfo
　　　　}
　　　　LS / etc /
　　check_cpu [not call the function, the function body command is not executed; where to invoke the function body in order to perform there]

    2.  *fun_name() {

　　　　Function body
　　　　$ 2 ... $ 10 $. 1
　　　　}
　　fun_name 2. 3. 1
: WQ
　　function.sh. 4. 5. 6. 7. 9 10. 8 12 is 13 is 14. 11

　　If the parameters can be used directly on the outside body of the function

Second, variable

　　local local variables

　　loacl i = 1

　　If the function in vitro also defines a variable the same, does not take effect

　　Extended: source / bash / chmod + x [full path of parent and child processes]

Three, return

　　The end of the function body to perform

　　And exit the difference

　　return and exit are specified by the return value of 0 for successful execution, failed execution on behalf of 1-255

　　return only for functions in the body;

Fourth, iterative

　　Iteration must specify an initial value