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The day before yesterday, I saw a reader sharing several Shell script example topics in the group. I simply saw them. Why not write and consolidate the basic knowledge, as follows: 1. Concurrently obtain the hostname from several machines, record the time spent returning the information, and redirect to a file hostname Txt, output the CPU info ...

Tools find, locate, grep, whereis/which, type. find File Finder find supports a variety of parameters. Here are some of the commonly used parameters. For more information, see: find command Common Conditions -type Type parameters f Normal File l Symbolic Connection d Catalog c Character Device b Block Device s socket p Fifo -inam ...

1. Backup data with mysqldump command MySQL provides a convenient tool mysqldump for exporting database data and files from the command line. We can directly export the database content through the command line. First, let's briefly understand the usage of mysqldump command: mysqldump -u root -p --databases Database 1 database 2 > xxx.sql ...

0. Preface Two suggestions: ~go B Station Find Java Learn the course once ~I understand that I must follow the instructions and do more than once This article summarizes more categories, not suitable for beginners, beginners suggest to go B Stop learning. 1. Overview and Basic Grammar Introduction to 1.1 java language Codes a ...

Common commands Enter directory cd /usr #Enter the usr directory View catalog file ls #View all files in the current directory ll #View the details, permissions, size, time, etc. of all files in the current directory #ll command = = ls -l command ls Directory name #ls + directory name, you can view all files in the specified directory ...

System D uniformly manages the startup logs of all units. You can view all relevant logs (kernel log and application log) with only one command of journalctl. The configuration file for logs is / etc / Systemd / journald conf. Persistent systemd log CentOS 7 can use SYSTEMd journal as the log Center Library (generating log folders). Th ...

preface Try not to use all the questions. The commands tail, cat, grep and awk are directly executed to get the results. They are all programmed with bash shell statements, so the program is the most efficient The following is my method of learning Shell for reference 1. Take half a day to see the basic usage: Shell tutorial - rookie tut ...

Why introduce users and groups? Security - permission management (which files can be read and written by a user and which processes can be started by a user) - Resource Management (storage resources, IO, CPU resources) [root@localhost ~]# id root uid=0(root) gid=0(root) group=0(root) Each user has a unique uid and gid A user can have differen ...

Preface _This paper simply records the knowledge about Shell scripting. Original video directions:     Original video Click here 1. Shell Variables (1) Definition: Variable name = variable value A=hello # Define variable A whose value is hello echo $A # Call the variable, note the money, "$" Be careful: Call another ...

A. View disk devices /proc/partitions Question 1: how to add a new hard disk virt-manager Question 2: how to find files in the file system find /mnt/ -name "*westos*" find /mnt/ -name westosfile1 Question 3: set the depth to find the file find /mnt -maxdepth 1 -name westosfile1 #The depth of the lookup file is 1 layer find /mnt -mi ...