exit status

1. Docker Container Restart policy The restart policy for Docker containers is a start-up strategy for production environments that can be ignored during the development process. Docker container restarts are done by the Docker daemon and are

Shell Builtin variables (shell built-in variables) $ BASHThe path to the Bash binary itselfbash $ echo $ BASH/bin/bash $ BASH_ENVAn environmental variable pointing to a Bash startup file to be read when a script is invoked $ BASH_SUBSHELLA variable

Shell common knowledge-general Linux technology-Linux programming and kernel information. The following is a detailed description. Shell common knowledge 1. system environment variables after users log on to the system $ HOME user's own directory $

Reprint could not find the original source.Recently in Linux programming found a strange phenomenon, is to link a static library always error, similar to the following error: (. text+0x13): Undefined reference to ' func ' About

Return, break, and contiue are language structures, just like if statements, but exit is a function. 1. function of exit: Outputamessageandterminatethecurrentscript outputs a message and terminates the current script. If a piece of text contains

From: http://ticktick.blog.51cto.com/823160/431329 Recently, programming in Linux finds a strange phenomenon, that is, errors are always reported when a static library is linked, similar to the following errors:(. Text + 0x13): Undefined reference

The only way to create a new process in Linux is to use the fork () function. The fork () function is a very important function in Linux, and there are some differences from previous functions, because the fork () function looks like it executes

If condition test statement If-then-fiThe IF condition test statement runs the command after the if (judgment).If the exit status code for this command is 0, the command in the then section will be executed.If the exit status code for the

Create a shell scriptWhen you create a shell script file, you must specify the shell to use in the first line of the file, in the format:#!/bin/bashCreate and execute SH scriptCode 1-1[Email protected]:/data# cat demo1 #/bin/bashdatewho[email

I. Condition testing: Test [The command test or [can test whether a condition is true, if the test result is real, the exit status of the command is 0, if the test result is false, the exit status of the command is 1 (note the exact opposite of the

1 Create Shell script FileTo create a shell script file, you must specify the shell you want to use on the first line in the following format:#! /bin/bashThen add a comment to the shell file that explains what the script file is used for, who

Programming Basics:Program: Instruction + dataProgram Programming Style:Program: command-centric, data-serving instructionObject type: Data-centric, instruction serves dataShell Program: Provides the programming capability to interpret the execution.

1, numeric and numeric expressionsAWK does not provide a string-to-number function, but awk is simple: Add a 0 to the string, such as S = "123", then N = 0 + S, and assign the number 123 to N.2. How to print the first few linesHead-n n filename#

1. Define Variables 1) when defining a variable, the variable name does not contain the dollar sign ($), for example:Var = "Hello World"2) Note that there is no space between the variable name and equal sign, which may be different from all

Shell script programming and file system RepairGuideThe Linux Foundation has initiated the LFCS certification (Linux Foundation Certification System Administrator) Linux Foundation Certified Sysadmin, which is a brand new certification system, the

The King of text sorting: the sort command, the King sort Directory: 1.1 option description 1.2 sort example 1.3 in-depth research on sort Sort is a sorting tool that perfectly implements the Unix philosophy: "do only one thing and do it perfectly ".

Introduction When you often use a system, it is often in a fixed usage mode. Sometimes, you do not get into the habit of doing things in the best way possible. Sometimes, your bad habits may even lead to confusion. One of the best ways to

The exit and _ exit functions are used to terminate a program normally: _ Exit immediately enters the kernel, and exit is used to execute some cleanup operations (including calling and executing various termination processes, close all standard I/O

Awk control statement The break and continue statements can use the break statement to exit the loop when a specific condition is true. When a specific condition is true, the continue statement skips the continue statement, switches the statement

Centos compiles start-stop-daemon and supports the latest option (-- chdir) start-stop-daemon, which is a debian tool. This library is not available in centosredhat release. To be compatible with some scripts to call this program, we need to