Shell script learning-Why shell programming

Shell is a command interpreter. It is an insulation layer between the operating system kernel and the user. To be precise, it is also
A powerful computer language. A shellProgramIt is called a script and is a very easy-to-use tool.
Combine system calls, public programs, tools, and compiled binary programs to build applications. In fact, all UNIX
Commands and tools, coupled with public programs, are callable for shell scripts. If these are not enough
Shell built-in commands, such as test and loop structure, also add strong support and flexibility to the script.
Management System Tasks and other repetitive routines do very well and do not need the flashy maturity at all.
Compact programming language.

For anyone who wants to be well versed in some system management knowledge, mastering shell script knowledge is the most basic.

People may not really want to write some scripts. Think about the Startup Process of the Linux machine, in this process, it will certainly run
The scripts in the/etc/rc. d directory are used to store system configuration and establish services. Have a detailed understanding of these startup scripts for the Analysis System
Behavior is very important, and sometimes it may have to be modified. A shell script is a quick and dirty method similar to a snack bar. When you use a prototype to design a complex
In the first stage of project development, even if a limited subset is obtained from the function, it is put into shell scripts.
This method can be used to test and try running the program results.
Such as C/C ++, Java or PerlCodeFirst, the main defects and traps are often discovered.