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  "contentMarkdown": "# 【batshell】Shell进阶\n\n> 创建时间：2021/7/21 15:42\n\n* permission\n    * chmod\n  * text processing\n    * grep\n    * awk\n    * sed\n      * Substitution command\n    * xargs\n  * 输出重定向\n  * test命令\n  * Ref\n\n## permission\n\n### chmod\n\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n\nmake it executable\n\nPermission:\n\n  * read (r) = 4\n  * write (w) = 2\n  * execute (x) = 1\n\nEach permission may be on or off for each of three categories of users: the file or directory **owner** ; other people in the same **group** as the owner; and all **others**.\n\n  * u stands for user.\n  * g stands for group.\n  * o stands for others.\n  * a stands for all.\n\n`chmod u+x filename` \\- grant the execution permission to the owner of the file\n`chmod +x filename` = `chmod a+x filename`\n\n`chmod 777` = `chmod a=rwx`\n\n## text processing\n\n### grep\n\ngrep is a command-line utility for searching plain-text data sets for lines that match a **regular expression**.\n\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n\nThe caret ^ and the dollar sign $ are meta-characters that respectively match the empty string at the beginning and end of a line.\n\n### awk\n\nhttps://en.wikipedia.org/wiki/AWK\nAWK (awk) is a domain-specific language designed for text processing and typically used as a data extraction and reporting tool.\n\n### sed\n\nhttps://www.geeksforgeeks.org/sed-command-in-linux-unix-with-examples/\nhttps://en.wikipedia.org/wiki/Sed\n\nsed (\"stream editor\") is a Unix utility that parses and transforms text, using a simple, compact programming language.\n\n#### Substitution command\n\nsed OPTIONS... [SCRIPT] [INPUTFILE...]\n\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n\n### xargs\n\nhttps://en.wikipedia.org/wiki/Xargs\n\nxargs (short for \"eXtended ARGuments\" ) is a command on Unix and most Unix-like operating systems used to build and execute commands from standard input.\n\nSome commands such as grep and awk can take input either as command-line arguments or from the standard input. However, others such as cp and echo can only take input as arguments, which is why xargs is necessary.\n\n## 输出重定向\n\n0：标准输入；1：标准输出；2：标准错误\n\n2>&1表明将文件描述2（标准错误输出）的内容重定向到文件描述符1（标准输出），为什么1前面需要&？当没有&时，1会被认为是一个普通的文件，有&表示重定向的目标不是一个文件，而是一个文件描述符。\n\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n\nhttp://xstarcd.github.io/wiki/shell/exec_redirect.html\n\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n\n## test命令\n\nhttps://www.runoob.com/linux/linux-shell-test.html\n\n## Ref\n\nhttps://zhuanlan.zhihu.com/p/47765176\nhttps://en.wikipedia.org/wiki/AWK\n\n\n> 创建时间：2021/9/24 18:20\n\n* 进程查找与杀死\n    * tasklist\n    * taskkill\n    * 完整代码\n  * 相关知识点\n  * 查询程序及命令行参数\n  * Ref\n\n## 进程查找与杀死\n\n### tasklist\n\n  * **Image name** is the name of the executable, e.g. explorer.exe or myapp.exe\n\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n\n### taskkill\n\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n\n### 完整代码\n\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n\n## 相关知识点\n\n1>nul 意思是不显示命令运行的正确提示\n2>nul 是不显示错误提示\n一起就是 正确错误的都不显示\n\n> 是重定向符号\n>  nul是空设备的意思\n>  把提示输入到空设备就不显示了\n\n## 查询程序及命令行参数\n\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n```csharp\nstring a = "test";\nstring tmp = "est";\nstring b = "t" + tmp;\nConsole.WriteLine(string .ReferenceEquals(str1, str2));\n\n```\n\n## Ref\n\nhttps://blog.csdn.net/c1520006273/article/details/50539092\n"
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