Shell

#!bin/bashLog_dir=/var/logRoot_uid=0if[' $UID '-ne ' $ROOT _uid ']ThenEcho ' must is root to run this srcripts 'Exit 1FiCD $Log_dir | | {echo "Cannot change Necessarydirectroy" >&2Exit 1}Cat/dev/null >messages&&Echo ' log is cleaned up. 'Exit 0 #返回0

Use the time of the Linux system in the second 1-59 to guess the number game, the detailed code is as follows:#!/bin/bash#author wangning#date 2017-7-15#qq 1198143315#email [email protected]##### ############################## #define  color#########

Script name is zk_run.shPaste the following code into the zk_run.shAdd Execute permissions chmode +x zk_run.shRun the script./zk_run.sh startIf you find that zookeeper is not starting up, try adding the following line at the top of each zookeeper

Edit the. bash_profile file under your own user#. Bash_profile#exportPs1= "\n\e[1;32m[\e[0;31m\u\e[0;[ Email protected]\e[0;31m\h\e[1;32m]\e[1;32m[\e[0;34m\w\e[1;32m]$ "# Get the aliases and functionsIf [-f ~/.BASHRC]; Then. ~/.bashrcFi# User

1 ImportOrg.eclipse.swt.widgets.Display;2 ImportOrg.eclipse.swt.widgets.Shell;3 4 Public classSwt_shell {5 6 Public Static voidMain (string[] args) {7Display display =Display.getdefault ();8Shell Shell =NewShell ();9Shell.setsize (800,

#!/bin/SH###################################################### name:create_nginx_conf.SH# VERSION:V1.0# Author: OPS Rookie # Description: Creating Nginx-related Profiles # Create Date: .- --Geneva# Email: ############################################

The shell script in Crontab writes the top information to the file:Note:1, Top-n 1 for Execution 1 exit (default top is not exited),-D 1 for 1 seconds2, crontab need to add/bin/bash# CRONTAB-E*/5 * * * */bin/bash/usr/local/bin/top.sh# VI

Pipe character Fg Bg Sleep Variable Set Defining variables Variable classification Cancel a variable environment variable configuration file Pipe character管道命令操作符是：”|”,它仅能处理经由前面一个指令传出的正确输出信息，也就是

Macserver need to open remote login first. Open with: System Preferences, share check remote loginFrequently used commands are:Copy (copy native file to remote server) Scp-r Local path/file userName@192. 168. XXX. XX:/tmp#userName为远程serverusername称,

#!/bin/bash#version 1.1#by zengj#using checking URLs. /etc/init.d/functions Checkurl () { wget-o/dev/null-t 3--tries 1--spider $ >/dev/null 2>&1 if [$? -eq 0] Then action ' This $ is true '/bin/true else action ' This $

TextAaaaabbbbbcccccddddEeeeefffffkkkkkvvvvNnnnngggggThe results I hope to receive are as follows: AAAAA|BBBBB|CCCCC|DDDDEeeee|fffff|kkkkk|vvvvNnnnn|gggggMatch requirements: You want to insert a "|" between every 5 characters, and if the number of

1. The concept of environmental variablesEnvironment variables are used to store shell sessions and work environments, allowing the shell to easily access the program in the set value, environment variables are divided into global variables and

CutThe Cut command extracts text columns from a text file or text stream.Cut grammar[[email protected] ~]# cut-d ' The delimiter character '-f fields The PATH variable is as follows[Email protected] ~]# echo

#!/bin/bash################################################################################# Filename:upgrade_ Project.SH# Summary: Project Upgrade Script # LICENSE:GPL # Version:1.0# Author:jet bi# Email:1207501666@qq. com# Date: ./ ,/ ,# Note:

5.3 Shell Programming 2Condition Judgment:If the user does not existAdd user, give password and show add successOtherwiseDisplays if it already exists, does not addHow do I make conditional judgments in bash?Condition Test Type:Integer testCharacter

650) this.width=650; "Src=" https://s2.51cto.com/wyfs02/M02/99/D8/wKioL1lNDBWiKp5qAAHumaoOG3U812.png-wh_500x0-wm_ 3-wmp_4-s_3170601832.png "title=" variable. png "style=" float:left; "alt=" Wkiol1lndbwikp5qaahumaoog3u812.png-wh_50 "/>The shell is a

some things to note about shell script:1, #这个符号是注释本行, usually used for annotations, #! Except that it is used to label which Shell executes this script,2, the order of execution from top to bottom, from the right3, ignoring blank lines, tab spaces4,

The definition format of the function:function Funname (){Actionreturn xxx;}1, can be with function fun () definition, can also be directly fun () definition, without any parameters2, the parameter returns, can display add: return returns, if not

First, if else// If the Else branch does not have a statement execution, do not write this else1. If statementIf conditionThenCommand1Command2Command3...FiWrite a line:if [$ (ps-ef | grep-c "SSH")-gt 1]; then echo "true"; Fi2. If ElseIf

Arrays ArrayVariables: Storing the memory space of a single elementArray: A contiguous memory space that stores multiple elements, which is equivalent to a collection of multiple variables that support sparse formatting, which is a discontinuous