linux shell

There are a number of ways to bash the shell script, now make a summary. Suppose we write a shell script with the file name hello.sh, the file location in the/data/shell directory, and already have execute permissions. Method One: Switch to the directory where the shell script is located (at this point, called the Wor

Linux special symbols Common special symbols in shell are listed as follows: #;.,/\ 'String' |! $ {}$? $ * "String "***? : ^ $ # $ @ 'COMMAND '{} [] [[] () | {XX, YY, ZZ ,...}~ ~ + ~ - \ # Comments)This is almost a full-market symbol, except for the "first line" that has been previously mentioned"#! /Bin/bashA well number often appears at the beginning of a line or after a complete command. This type of

Shell IntroductionThe shell is the interface between the user and the Linux operating system. There are multiple shells in Linux, where bash is used by default. The shell of the Linux system, as the

The configuration file is as follows ######### #BACKUP MYSQL config####### #database namedb_name=testdb_user=rootdb_pass=123456#### #backup Day Configbegin # # # # #day_backupdir =/home/backup/db/dayday_backup_fix=dayday_interval=1#### #backup Day Configend ############Backup Week Configbegin # #week_backupdir =/home/backup/db/weekweek_backup_fix=weekweek_interval=2#### #backup Week configend ########### #backup month config begin # # # #month_backupdir =/home/backup/db/monthmonth_backup_fix= mo

function Hellohello,jesson Today is February 01, 2015 Sunday 20:37:55 Cstback from the functionCheck load functions and delete functionsTo view the load function:SetDelete a functionunsetWe modify the above script as follows:#!/bin/bash#funfilecall#source function. Fun_test.shsetunset Helloecho "Now going to the function hello" Hello Jessonecho "back from the function"The results of the implementation are as follows:... now going to the function hello./funfilecall.sh: line 8:hello: Command not

As a programmer in the magical world of Linux, the Linux shell Command is a magic command. However, sometimes there are still some problems with the use. Next we will look at how to better use the Linux shell Command. Shell itself

BASH shell set font and background color Echo-e "\e[31mtest\e[41m" \e[30m change the display color of a character to black \e[31m change the display color of a character to red \e[32m change the display color of a character to green \e[33m change the display color of the character to light red \e[34m change the display color of a character to blue \e[35m change the display color of a character to purple \e[36m change the display color of the charact

First, the preface Using a proxy server haproxy load balancing for MySQL is a common scenario, to improve availability, when a MySQL problem occurs, such as a server failure, or data replication is interrupted, it is best to let haproxy know immediately, and then stop forwarding requests to it Haproxy How do you know if Mysql is a problem? Second, the solution to the idea (1) Write a shell script, check the state of MySQL, and then output the resu

Tags: Shell break Linux ScriptBreak and continue can all be used in the loop, but the two functions are a bit different, for example, break is jumping out of the loop, while continue is jumping out of the loop and going on to the next loop, we'll show the difference between the two in the following example.** Example: Print the number 1-10 if igt;8 you exit the loop. #!/bin/bash -for i in `seq

A few days ago I talked to a few colleagues about a problem: How do you pass an array to the inside of awk for processing in a shell script? No way was found at that time. Two days ago in the QQ group to discuss awk, the conversation inadvertently again. A chance to find a way of thinking, hereby share. Test environment: [root]# head-1/etc/redhat-release Red Hat Enterprise Linux Server release 6.5

: Network Disk DownloadContent Introduction······This book is a comprehensive tutorial on Linux command-line and shell script programming. The book is divided into four parts: the first part introduces the Linuxshell command line, the second part introduces the Shell Script Programming Foundation, the third part delves into the advanced content of

From the programmer's point of view, the shell itself is a program written in C language, from the user's point of view, the shell is the user and the Linux operating system communication Bridge. The user can either enter command execution or use shell scripting to do more complicated operations. In the increasingly pe

Http://www.cnblogs.com/suyang/archive/2008/05/18/1201990.htmlFrom the programmer's point of view, the shell itself is a program written in C language, from the user's point of view, the shell is the user and the Linux operating system communication Bridge. The user can either enter command execution or use shell script

From the programmer's point of view, the shell itself is a program written in C language, from the user's point of view, the shell is the user and the Linux operating system communication Bridge. The user can either enter command execution or use shell scripting to do more complicated operations. In the increasingly pe

Linux operating system can be divided into shell and kernel two parts, kernel is the kernel, provides the core functions of the operating system. The shell is the shell, which is connected to the kernel (kernel) and the user. This means that the user uses the shell to kernel

Linux Shell series tutorials and linuxshell tutorials To learn about Linux Shell, go to the Linux Emy Network (Linuxdaxue.com )! This series is suitable for Linux beginners. It is an entry-level tutorial for

Installation of Linux systems:1.linux System Installation Method three kinds:1. Install the Linux system independently.2. Install the Linux system on the virtual machine.A. Install the virtual machine, basically go all the way down.B. Install Linux.Partitioning is key when C.linux is installed./boot partition 100M./swa

has been learning, but also has been forgotten, today with the help of this blog post, to record their own learning process some of the most basic things!1. For#!/bin/bashfor i in {1..10}do echo $idoneScan the active IP in the target network segment#!/bin/bashfor IP in 192.168.1. {1..255};d oping $ip-C 2 >/dev/null, if [$?-eq 0];thenecho $ip is alivefidone2. If#!/bin/bash# determine if the current user is rootif [$UID-eq 0];thenecho You is root user.elseecho you are nothing.fiThis article is fro

Embedded beginners, the first time to upload code. Yesterday did a UDHCPD and Udhcpc Guardian, currently only with Shell imitation writing, what method can do guardian? #! /bin/sh #进程名字可修改 pro_name=udhcpc wlan=ra0 while true; # get $pro_name number of processes with PS num= ' PS aux | grep ${pro_name} | grep-v grep |wc-l ' # Echo $NUM # less than 1, restart process if ["${num}"-lt "1"];then echo "${pro_name} was Killed "

-INPCK-ISTRIP-INLCR-IGNCR ICRNL Ixon-ixoff-iuclc-ixany-imaxbel-Iutf8opost-OLCUC-OCRNL Onlcr-onocr-onlret-ofill-Ofdel nl0 cr0 tab0 bs0 vt0 ff0isig icanon iextenEchoEchoe echok-echonl-noflsh-xcase-tostop-echoprt Echoctl Echoke-flusho-extprocForwarding the above two articles is a workaround. The simple approach is to use/bin/bash instead of/bin/sh, which is normal in Ubuntu.^[[a^[[a^[[a^[[b^[[b problem solving when using the upper and lower keys to turn out historical naming in the