Shell

Day Three: Conditional selection Outline application Example Analysis Condition test if...else...fi Case...in...esac Implement function Menu : After executing the script Press 1 to display the current time Press 2 to show CPU load

Variable Get the native host name #hostname Get the system version number #uname-R Get CPU Type Get the CPU working frequency Cat/proc/cpuinfo Get Memory

First, compression and decompression 1, compress [-RCV] file or directory uncompress files. Z -R: Can be compressed together with the files in the directory -C: Export compressed data to standard output (output to screen) -V: Can display the

Description Cut press the column to split the file and you can specify the delimiters for each column. In cut terms, each column is a field, sometimes the first column, which may be described as the first field. Actual combat: Suppose there is a

For example, after more than one system, application installation, we often need to modify a lot of configuration files, with the VI editor means time-consuming, repetitive work, and SED can release us from the heavy duplication of work. How SED is

Copy Code code as follows: #!/bin/bash Load= ' uptime ' shijian= ' Date +%y-%m-%d-%t ' File=cpustatus.txt Touch $file All= ' Cat $file |wc-l ' printf "$load $shijian \ n" >> $file if [[$all > 60]]; ThenStarttime= ' cat

First script file Copy Code code as follows: #!/bin/bash echo "This are my I-A-bash code!" Exit 0 redirect Symbols and mathematical calculations Copy Code code as follows: #!/bin/bash Echo-n "The time and

Copy Code code as follows: #!/usr/bin/expect-f Set Timeout 30 Set Host "192.168.1.198" Spawn ssh $host Expect_before "No"? { Send "yes\r"} Sleep 1 Expect "Password:" Send "123456\r" Expect "*#" Send "echo my name is

1. Show the top 10 processes consuming memory/cpu Copy Code code as follows: PS aux | Sort-nk +4 | Tail PS aux | Sort-nk +3 | Tail 2. View process Arrange by memory from large to small Copy Code code as follows:

1. View all users in Linux (1) in the terminal. In fact, only need to view the/etc/passwd file on the line.(2) Look at the third parameter: More than 500, is built behind the user. Others are users of the system. or use cat/etc/passwd |cut-f 1-d:

Sometimes we need to delete the empty folder recursively, search the internet for a while, did not find a better shell script, so we wrote a Script Copy Code code as follows: #!/bin/bash # Author: Ten years later, Lou's brother #

Copy Code code as follows: [Root@web-server php]#/etc/init.d/httpd Restart Shell-init:error Retrieving current Directory:getcwd:cannot access parent directories:no such file or directory This error indicates that the GETCWD command could

1, configure multiple server logs as long as the $website variable is incremented and separated by a space.2, looping to create the log directory3, after the split with XZ compression, of course, can not be installed with Gzip bzip2 and so on.4,

Check to see if the remote port is open to bash: Copy Code code as follows: echo >/dev/tcp/8.8.8.8/53 && echo "Open" To get a process into the background: Copy Code code as follows: Ctrl + Z To move a

Build a Php+mysql platform, the range for DVWA, set the SQL injection range level of low (easy to test use).Enter 1 in the Submit box, grab the package with Burp, copy the package data to the Cookies.txt document, and drag to the Kali

Although Git is a distributed version management system, for team project development, it is common to create a git server on a separate server. Similar to Svn,git server, there are several ways of configuring it. For more information, refer to

the function of the echo command is to display a piece of text on the display, which generally acts as a hint. the general format of the command is: Echo [-n] string where option n means that the output text is not wrapped, the string can be quoted,

Testing and comparison of shell scriptsTest command: Checks the file type and compares the value (depending on the execution result of the expression (true or false), returns an exit status. ）NAMETest-check file types and compare

I see in the study not only has the break and the continue existence, as well as break-n and the continue-n existence so what difference does it have.You can then write the test set code:For i in a B c DDoEcho-n $iFor j in ' seq 10 'Doif test $j-eq 5

I have previously written a script similar to mysql full and incremental backup, but it is too simple. Last night, I wrote an instance for mysql5.7 for the company's online server, which is relatively more optimized.Note: This script is only