jumo process control

Case statementcase $变量名 in "值1"） ? 如果变量的值等于值1,则执行程序1 ;; ?"值2"） ? 如果变量的值等于值2,则执行程序2 ;; ? ...省略其他分支... ? *) ? 如果变量的值都不是以上的值,则执行此程序 ;;esac ?//case反过来写"case语句的使用实例"#!/bin/bashread "please input yes /no": chocase "$cho" in "yes") ? ? echo "输入正确！";; ?"no") ? ? echo "输入错误！";; ? ?*） ? ? echo "输入异常！";;esac------------------------------------使用case的语句进行流程控制------------[[emailprotected] shell]# cat case_a.sh #!/bin/bashread opcase $op in ?a) ? ?echo "你输出的信息为 a ";; ?b) For statementfor 变量 in 值1 值2 值3 ...

loop end condition is not reached, and the shell uses two commands to implement the function: Break and continue.Break Command The break command allows you to jump out of all loops (all loops after the execution is terminated).In the following example, the script enters a dead loop until the user enters a number greater than 5. To jump out of this loop and return to the shell prompt, you need to use the break command.#!/bin/bashWhile:DoEcho-n "Enter a number from 1 to 5:"Read AnumCase $aNum in1

8.1: IntroductionThis chapter describes the process Control for UNIX, including creating new processes, executing programs, and terminating processes. It also describes the various id--of the process properties, the actual, valid, and saved user and group IDs, and how they are affected by the process

1.What is a processIn a computer, a process is the execution of a program.Processes include: 1) The code required to execute this procedure2) Relevant data required to execute the program3) information required by the operating system Management process - - Process Control blockOK to understand the basic concepts of th

I. Concept of process group, job, session1. Process group: is a collection of one or more processes. Typically, associated with the same job, you can receive various signals from the same terminal. Each process has a unique process group ID. Each process group can have a lea

!: Control and description of the process* Process Definition: A process is a separate function of the program on a data set on a dynamic running process (is the operating system scheduling and resource allocation of the basic unit, the