Learn some Linux every day (updated: 2014.08.15)

1. How does the shell script debug?

The first time I wrote 300 lines of shell script, such a big lump how to debug ah? Do you want to take it out and test it?

SH [-NVX] Scripts. SH options and Parameters:-n  : Do not run script, query only the syntax of the problem;-v  : Before running the Sccript, the contents of the scripts are first output to the screen;  : Displays the script content used to the screen, which is a useful parameter!

Reference: http://vbird.dic.ksu.edu.tw/linux_basic/0340bashshell-scripts_6.php

2, string splicing problem!

A series of start-up services are required after installing cobbler, here is the code I wrote:

12for in"cobblerd httpd xinetd"3 do     4        service ${serv} start5        chkconfig ${serv }on6      Done

Here will be "Cobblerd httpd xinetd" as a service! The original is treated as a string, should be replaced by:

12for in  cobblerd httpd xinetd3do       4        service ${serv} start5        chkconfig ${serv}on6       Done