Shell

Wscript.Shell (Windows Script Host Runtime Library) is an object, and the corresponding file is c:/windows/system32/ Wshom.ocx,wscript.shell is a component that the server system will use. Shell is the meaning of "shell", this object can perform

shell script automatically backs up the database 1. Writing Backup scriptsVI backup.sh#!/bin/bashdate=`date +%Y%m%d_%k%M`  mysqldump-uroot-p12345-h127.0.0.1 db | gzip >/home/ubuntu/root/db_$date.sql.gz2. Modify Script executable

3.1 Regular Expression BasicsThe primary function of regular expressions is text query and string manipulation. is actually string filtering.Regular expressions include ordinary characters and metacharacters character, meta-character main, see the

Transferred from: https://zhidao.baidu.com/question/357781350.html while Read-u3 i && Read-u4 J; Do Echo done34Read-u3 I means to read a row of data in the I variable from FD # 3rd (file descriptor, filename descriptor), so you know what Read-u4 J

Open multiple sub-processes in the script with & background, and use the wait command to make these sub-processes execute in parallel.Example 1:fun1 () {whiletruedoesecho1sleep1done }fun2 () {whiletruedoecho2sleep 1 Done &&WaitExample

Specify bashShell script first line, #! What should it be?Most of the cases/usr/bin/env bash,/bin/bash,/usr/bin/bash,/bin/sh,/usr/bin/env sh are equivalent, but few cases still have pits. If the default shell may not be bash, such as a release law,

The shell can be said to be an interpreter while providing a running environment for the code to run. and provides the programming capabilityThe shell does not have its own library, it just writes the applet commands within the command invocation

#!/bin/Bashprocess_name="Org.apache.catalina.startup.Bootstrap"Shutdown_call=0functionShutdowntomcat () {process_pid=`PS-ef |grep "$process _name"|grep-V"grep"|awk '{print $}'` forIinch$process _pid Do Echo "Info:kill the Tomcat process [$

1. Field (column) Extraction command: Cut [option] file nameOptions:-F column number (extract the first few columns)-D delimiter (split column by specified delimiter)[email protected] sh]# cat student.txt idnamegendermark1alex male 112boby male

#!/bin/bash#比如需要判断一个变量是否含有值:if [[ -z $1 ]] ; thenecho "Something like empty!"exit 0;fi#判断上一条语句是否执行成功if [[ "$?" -eq 0 ]] ; thenecho "$1 更新成功."exit 0;fi#下面再举一个实例NovaPath=”/home/malu/”NovaFile=”/home/malu/access.log”#这里的-x parameter determines whether $

0. Standard format for professional scriptingFunction 1 function 2main function main $*1. Use the Dos2unix command to convert scripts developed under WindowsDos2unix is not installed by default and can be installed in Yum# Dos2unix web_jk.shdos2unix:

1. Grammatical structure2. Case studies2.1 Batch Decompression#!/bin/bashcd/root/test/ls *.tar.gz > Ls.logls *.tgz >> ls.logfor i in $ (cat ls.log) do tar-zxf $i &A mp;>/dev/null donerm-rf ls.log~

#!/bin/bash#fail2ban-0.8.14.tar.gz#python > 2.4v#user:roottar  -zxf  fail2ban-0.8.14.tar.gzcd /root/fail2ban-0.8.14/python setup.py install cp /root/ Fail2ban-0.8.14/files/redhat-initd /etc/init.d/fail2banchkconfig --add fail2bansleep 1rm  -rf /root/

[email protected]:~# ls while50.sh while50.sh[email protected]:~# cat  While50.sh #!/bin/bashlogfile=/root/192.168.1.50.ping.logwhile truedo    echo  -n $ (date +%y-%h:%m:%s)  >> $logfile     ping -c1 -w1  192.168.1.50 >/dev/null     #ping   192.168.

The && operator syntax is formatted as follows: Command1 && command2 [&& Command3 ...] 1. Use && connection between commands to implement logic and functions. 2. Only the command on the left of && returns True (command return value $?). = = 0) The

First, the text processing1. Extract key word frequency times by row (for example, 5th column)awk ' begin{fs= ' | '} {a[$5]+=1;} END {for (i in a) print I ":" A[i];} ' Opt. Forumlogicnewserver_action_20161107.log | SORT-NRK 2-t ': '2, log users per

~ Home Catalogue ls ~"Inside the inverted quote is the command echo ' ls ' | ' Echo ls ' | echo ' echo ls ' | ' echo ' echo ls ' replace command $ ()! Take sung with the historical Command (!123) 123 is the history display#代表注视信息$ take Variable

1. Stitching strings * #!/bin/sh write_log () {Local up_name =$1 local num =${# string " while [$num-le 256 ]; do up_name = " $up _name* " num =$ (($num + 1 done echo $up _name}write_log " wang " Output:wang******************

Take a look at several common sorting algorithms in the next two days.1. Bubble Sort MethodEach time the adjacent elements are compared from i=0, if arr[i]>arr[i+1], they are exchanged. Until the biggest element is pushed to the end. Go back to i=0

node. JS Reverse ShellExcerpt from: http://www.itfang.net/?p=109The javascript below is a node. js Reverse connection shell.This payload will generate a/bin/sh shell, create a TCP connection to the attacker's server, and bind shell commands in the