摘要： 1. classfys according to the range in which configuration files take effect. 1.1 The global configuration file /etc/profile : /etc/profile.d/*.sh /etc 阅读全文

摘要： 1. Basic grammar egrep = grep -E egrep [OPTIONS] PATTERN [FILE...]2. Meta-charecter of extended regexp 2.1 Character match .： Matchs any single charac 阅读全文

摘要： 1. grep : Global search Regular expression and Print out the line. 1.1. function：searches the given FILEs for lines containing a match to the given PA 阅读全文

摘要： 1. 基本概述 1.1 文件的权限主要针对三类对象进行定义 owner: 属主, u group: 属组, g other: 其他, o 1.2 每个文件针对每类访问者都定义了三种权限： r: Readable w: Writable x: eXcutable 1.3 对文件而言三种权限分别表示： 阅读全文

摘要： 1. linux security context Which resources a process can access depends on the user running the process. For example,the root user own the following fi 阅读全文

摘要： 1. cp : copy files and directories 1.1 Basic use of cp : cp SRC DEST SRC is a single file： If DEST does not exist ：create DEST and copy the content of 阅读全文

摘要： 1.more : file perusal filter for crt viewing -d: 显示翻页及退出提示2.less : opposite of more3.head : output the first part of files head [OPTION]... [FILE]... 阅读全文

摘要： 1. wc : print newline, word, and byte counts for each file [root@bogon ~]# wc /etc/passwd 44 88 2301 /etc/passwd -l: lines -w: words -c: characters2. 阅读全文

摘要： 1. program：instruction+data data structures + algorathms 2. IO redirection：change the position of standard input and output 2.1 Output redirection : C 阅读全文

摘要： 1. The command history 1.1 history ：Display or manipulate the history list. [root@promote tmp]# history //Display the history list. -a: Append newly e 阅读全文

摘要： 1. Category of directory The shell working directory. The current directory which refers to the shell working directory. HOME directory: root : /root 阅读全文

摘要： 1. The system clock Timing by the Linux kernel by the working frequency of the CPU. The date command query and set the system clock.2. The hardware cl 阅读全文

摘要： 1.definition date - print or set the system date and time2.SYNOPSIS 2.1 Display the current time in the given FORMAT. date []... [+FORMAT] FORMAT : re 阅读全文

摘要： #!/usr/bin/env python# Author:liujundef func1(): #This is a function """ttest....""" print("in the func1") return 0def func2(): #This is a process """ 阅读全文