Shell

The following command lets you see which CPU the process is running on. vostro-270s:$ Ps-elo RUSER,PID,PPID,PSR Root 3 2 0 Root 5 2 0 Root 8 2 0 Root 10 2 0 Root 11 2 0 Root 12 2 0 To explain the above command, the PS command displays the status

#!/bin/bash #递归打印当前目录下的所有目录文件. PRINTF () { ls $ | While read line #一次读取每一行放到line变量中 do [-D $1/$line] && { dir= "$1/$line" echo $ DIR } dir1= ' dirname $DIR ' #求路径. a= ' ls-f $DIR 1 | grep/| grep "\"

The difference between a single middle bracket and a double bracket in a shell 1.["[" is an executable program, the path is "/usr/bin/["He is equivalent to the executable program "test". Example:If [3-eq 2]; Thenecho "= =";Elseecho "!=";Fi

In operation, you will encounter network bandwidth problems that need to limit the use of your shell applications (such as wget, Crul, FTP, SFTP, etc.) to connect to the Internet. How to set the network bandwidth without using complex firewall rules?

A Cat 1.cat file1 file2 file3 ... 2. Use a pipe to read from the standard input: echo "Hadoop hive!" | Cat–file.txt 3. Compress Blank Lines (1) Compress multiple continuous whitespace behaviors single Cat-s file (2) Remove blank lines Cat File.txt |

Shell Programming I. Introduction to the ProgramProgram程序：算法+数据结构数据结构：数据在计算机中的类型和组织方式算法：处理数据的方式面向过程：以指令为中心，数据服务于指令面向对象：以数据为中心，指令服务于数据计算机：二进制执行Advanced Programming Languages:编译：高级语言->编译器->机器代码->执行解释：高级语言->执行->解释器->机器代码 shellThree major

Https://www.cnblogs.com/37yan/p/6962563.htmlCAUTION!!! If should is end with fiCAUTION!!! There should be a space between [and!, also between 1 and]1 ];then#!/bin/bash# Determine if the number of parameters passed in is not an if1 ];then echo

A shell script is a function that uses the Shell's command interpretation to parse a plain-text file and then perform these functions, or it can be said that a shell script is a collection of commands.The shell can be used directly above the

1, Special shell variable$# the number of arguments passed to the script$* displays all parameters passed to the script in a single string$$ the current process ID number for the script to run$! the ID number of the last process running in the

ObjectiveWe have successfully installed the Linux system--centos7, and now follow the super brother to the gate of Linux.So!Start a picture, equip all by dozen ...What the hell is this black one?Using Linux every day, is to open the virtual machine,

1. Preface This is a series of learning documents. Based on the spirit of Internet sharing, it mainly comes from the shell area on the Forum. It has been organized and is the content of a book. Therefore, copyright belongs to the original author

Differences between return and exit in Linux Programming Exit is used to end the execution of a program, while return is only used to return from a function. Return Return indicates that the function is returned from the called function to the main

In Bash, you can use the following three methods to process command lines:ParametersEach method has its own application scenario.1. perform direct processing, parse $1, $2,..., $ N in sequence, and perform manual processing respectively;2. getopts

root@bt:~/test# ln --helpUsage: ln [OPTION]... [-T] TARGET LINK_NAME (1st form) or: ln [OPTION]... TARGET (2nd form) or: ln [OPTION]... TARGET... DIRECTORY (3rd form) or: ln [OPTION]... -t DIRECTORY TARGET... (4th

Create a shell script for the android SD Boot Card #! /Bin/bashexport lc_all = CIF [$ #-ne 1]; then Echo "Usage: $0 " Exit 1; fidrive = $1 skipmedia = 0out_ready = 0 root_dir = $ (PWD) product = 's5pc110 '# offset offset_authkey = 1offset_bl1 =

The SET command can be used to set various shell options or to list shell variables. A single option can be used to set common features.After some options, the-O parameter opens special features. After some options, using the + O parameter will

Shell basics 2: Search Skills, use of find and xargs Execute shell commands using exec or OK When using find, you only need to write the desired operation in a file, you can use exec to search with find, which

1. Conditional Variable replacement:BASH Shell can replace the conditions of a variable. It can be replaced only when a condition occurs.Put the condition in.(1) $ {value:-word}If the variable is undefined or the value is null, the return value is

Some questions on SuSE may need another reference: http://blog.chinaunix.net/u2/64804/showart.php? Id = 2026903 Related versions: Red Hat Enterprise Linux   Symptom:   If you set the value in the file/etc/security/limits. conf. However, if you log

Http://fox.he100.com/showart.asp? Art_id = 122 & cat_id = 1 Prevent web shell attacks) Prevent web shell attacks) The virtual host Administrator has been working for one year, and has some knowledge about the prevention of Web shell in NT. Now we