Shell

Code block redirection refers to redirecting standard or standard output to a file within a block of code, or leaving the default state outside of a block of code, in other words, code block redirection refers to the redirection of standard input or

1. At the command terminal to get root user rightsIn the terminal, enter:sudo passwd rootEnter new UNIX Password: (enter your password here)Retype new UNIX Password: (Determine the password you entered)Passwd:password updated successfullyLater, if

#1Sed-I's/Disabled = true/Disabled = false/'/etc/fdfs/storage. conf#2Sed-I's/base_path = \/home \/yuqing \/fastdfs/base_path = \/fdfs \/storage/'/etc/fdfs/storage. conf#3Echo "Enter tracker_ip :"Read tracker_ipEcho "$ tracker_ip"Sed-I

Sed: A stream editor or a row editor. Sed processing process: sed reads a row from the source file and places it in a temporary buffer zone. This buffer zone is called a mode space and uses the corresponding mode to process the mode space, the

1. Single line comment: # echo "Hello World"2. Multi-line comment:: Tar cvzf $ databak_dir $3 $ date '. SQL' using databak_dir%3%date'.tar.gz '> 2> & 1SCP export databak_dir%3%date'.tar.gz '[email protected] "":/DIR # transfers backup files to

In the shell command terminal, CTRL + N is equivalent to the downward direction key, and CTRL + P is equivalent to the upward direction key.You can use them or the arrow keys in the Command terminal to quickly find historical commands. This is also

Part 1 simple common commands 1. Date command   2. Display calendar Cal   3. display the current directory pwd   4. Switch the current working directory By default, the main directory of a Super User is/root, while that of a common user is the same

Preface: Take notes on network-related knowledge, including IP address A/B/C classification, static address configuration/DNS configuration, and nic information viewing. *) Division of A/B/C/D network addresses IP address = network address + host

A variable is a memory space. When a variable is referenced by a variable name, it is called a named memory space. To define a variable, assign a fixed memory space to the variable. assign a value to the variable, that is, fill the data in the

Script: the source program implemented by the command flow control mechanism based on the actual situation. Script description: 1. Start with shebang, that is #! /Bin/bash. The path of the script interpreter is specified here. 2. Comments starting

Single branch if statement If condition; then statement1 statement2fi Dual-branch if statement If judgment condition; then statement1 statement2 ...... Else statement3 statement4 ...... Fi Multi-branch if statement If condition 1; then statement1

BASH Shell has an extglob option. After the shell is enabled, five pattern matching operators can be identified to facilitate file matching. Method: Run shopt command: shopt-s extglob Close method: shopt-u extglob When this feature is enabled,

I am often very lazy. The main solution to laziness is to use scripts for automatic execution. However, sometimes, for example, processing a piece of data has not been completed, and the next execution starts again, this is a problem. Let's see how

After a netizen watched the old boy's shell video today, he asked the following question: 650) This. width = 650; "Title =" snap17.jpg "alt =" wkiol1oz8i_gwllfaaetvavr46c745.jpg "src ="

Jiebao Jiebao Jiebao Jiebao Jiebao This series of scripts has already opened a forum on GitHub. I name it "Easy shell" (Click here to enter ). At present, you have added the scripts in the previous phases. More scripts will be added to

? Time when the file is read #! /Bin/bash For file in 'ls/root' Do Stat $ File> 1.txt Sed-n "7 P" 1.txt> 2.txt Usetime = awk-F ":" '{print $2}' 2.txt Echo "time =" $ File $ usetime Done ? The while statement that reads each row of a file. Cat afile |

Tag: Shell 1. Search for all files larger than 500 mb in the current directory, write these file names to a text file, and count the number of files. Find/-size + 500 m-type F | tee/root/file.txt | WC-l or find/-size + 50 m-exec ls

Alias LL = 'LS-al'Use_color = false# Set colorful PS1 only on colorful terminals.# Dircolors -- print-database uses its own built-in Database# Instead of using/etc/dir_colors. Try to use the external file# First to take advantage of user additions.

In the shell command terminal, Ctrl + n is equivalent to the downward direction key, and Ctrl + p is equivalent to the upward direction key. You can use them or the arrow keys in the Command terminal to quickly find historical commands. This is

Time when the file is read #! /Bin/bash For file in 'ls/root' Do Stat $ file> 1.txt Sed-n "7 p" 1.txt> 2.txt Usetime = awk-F ":" '{print $2}' 2.txt Echo "time =" $ file $ usetime Done The while statement that reads each row of a file. Cat afile |