Linux shell脚本编程笔记的相关内容

[帮助文档] Linux系统的Shell命令如何查看实例的系统配置

通过云助手，您无需逐一登录ECS实例进行运维操作，只需编写可以查询系统配置的云助手命令，并根据系统返回信息做出应对机制，例如是否继续下载或者更新软件。本文以适用于Linux系统的Shell命令为例，介绍如何查看实例的系统配置。

linux shell脚本编程笔记（四）：获取字符串长度的七种方法

获取字符串长度的七种方法 1. ${#str} 2.awk的length 备注: 1) 最好用{}来放置变量 2) 也可以用length($0)来统计文件中每行的长度 3.awk的NF 备注: -F为分隔符，NF为域的个数，即单行字符串的长度 4.wc的-L 备注: -L参数 1) 对多行...

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linux shell脚本编程笔记（五）：重定向

I/O重定向简述：默认情况下始终有3个"文件"处于打开状态, stdin (键盘), stdout (屏幕), and stderr (错误消息输出到屏幕上). 这3个文件和其他打开的文件都可以被重定向. 对于重定向简单的解释就是捕捉一个文件, 命令, 程序, 脚本, 或者甚至是脚本中的代码块的...

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