How to learn shell programming? Getting Started with Linux
In the digital age filled with all kinds of Internet +, Linux operation and maintenance is becoming more and more automated, and more and more operation and maintenance workers are running on the road of automatic operation and maintenance. At present, the most popular operation and maintenance automation languages under Linux system are shell and Python.
Between the two, the shell is almost an operation and maintenance automation programming language that IT companies must use, especially in the operation and maintenance work of service monitoring, rapid business deployment, service start and stop, data backup and processing, daily analysis and other links. The shell is indispensable. Of course, Python is also more suitable for dealing with complex business logic, developing complex operation and maintenance software tools, and implementing web access. Shell is a command interpreter that interprets and executes commands and programs entered by the user. An interactive dialogue style that responds immediately as soon as a command is entered.
How should Shell learn?
1. First consolidate the foundation of shell programming
Basic knowledge of Shell programming, operating principle, program syntax, programming habits, variable knowledge
2. Basic and intermediate practical knowledge and skills of Shell programming
Various numerical operations on variables, conditional testing and comparison, if conditional judgment statements, shell functions, etc.
3, Shell programming junior and intermediate practical knowledge and skills
Case conditional statement, while loop and until loop, for loop and select loop, condition and loop control and state return value, shell array, etc.
4. Essential knowledge of efficient shell programming
Shell script development specifications and coding habits, debugging knowledge and skills of shell scripts, configuration adjustment and optimization of shell script development environment
5, the special application of shell
Enterprise application of Linux signal and trap command, application of expect automated interactive program, knowledge application of sub-shell and shell nesting mode.
Shell exists in the outermost layer of the operating system and is responsible for direct dialogue with the user, interpreting the user's input to the operating system, processing various output results of the operating system, and then outputting it to the screen and returning it to the user. All operations after entering the system username and face and logging into Linux are interpreted and performed by the shell. The update and iteration of the technology itself in the IT industry is relatively fast. With the methods, ideas, and hard work, I believe that friends will have good development.