ExamplesIn this section, we'll see couple of examples of the 'if/elif/else' statement.Exampe #1:#!/bin/bash # b.sh if [ "$#" -gt 0 ] then echo "There are $# args!" fi if [ "$1" = "arg1" ] then echo "argument 1 is $1" fi Output:...
命令类型: 内置命令:{shell 内置} 外部命令:在文件系统的某个目录下有与命令名称相应的可执行文件 date :时间管理 linux: rtc date -s "2012-05-23 01:01:01" //这样可以设置全部时间 硬件时间:hwclock 系统时间:date ——— #!/bin/bash start=$(date +%s) nmap man.linuxde.net &> /dev/null en...
The Bourne shell has special constructs for conditionals, such as if/then/ else and case statements. For example, this simple script with an if conditional checks to see whether the script’s first argument is hi: Bourne shell 具有特殊的条件构造,如 if/then/ else 和 case 语句。 例如,这个带...
This article explained how thebccommand works and provided several use-case examples. Thebccommand offers many possibilities and facilitates writing automation scripts in Bash. Next, read our detailed tutorial to learn more aboutBash math operationsand different commands you can use for arithmetic opera...
157 158 if (condition) 159 action(); 160 161 and 162 163 if (condition) 164 do_this(); 165 else 166 do_that(); 167 168 This does not apply if only one branch of a conditional statement is a single 169 statement; in the latter case use braces in both branches: 170 171 if (...
The examples in this article use thedockercommand. However, most of these commands also work with Podman. Podman provides a command-line interface similar to the Docker Engine. You canfind out more about Podman. Important sqlcmddoesn't currently support theMSSQL_PIDparameter when creating containe...
Line 9starts acasestatementchecking the user's input. Lines 10-11execute theapt updateorapt upgradecommand in place of the current shell. When the update or upgrade process ends, the terminal session exits. Line 12uses thebreakstatementto exit the infinitewhileloop and ends the script. The se...
We’ll primarily use examples in C for this chapter, but you’ll be able to carry the information over to C++. 了解如何运行C编程语言编译器可以让您对在Linux系统上看到的程序的起源有很大的了解。 大多数Linux实用程序和许多Linux系统上的应用程序的源代码都是用C或C++编写的。 本章我们将主要使用C的...
To try something more ambitious, you can run an Ubuntu container with: $ docker run -it ubuntu bash Share images, automate workflows, and more with a free Docker ID: https://hub.docker.com/ For more examples and ideas, visit: https://docs.docker.com/get-started/ Create an Azure IoT...
Examples: interfaces: mysql_read_config(<domain>)- gives the specified domain (httpd_t in this example) read access to MySQL config files init_daemon_domain(<domain>, <file_type>)- promotes the type given as the first argument to a domain, whileis used as an entry-point executable by ...