Shell

The content of this section:A sample shell script code to test the concurrency of the database.Example:#!/bin/bash#********************************# #并发后台运行fun # # forWanggy -- on- -# #note: www.jquerycn.cn # #fun_num Fun functions Background Run # #

Before constantly testing the Pgsql on VM VMS, it is still a bit cumbersome to install.So we collected a

One, the file operation1. Expression-D: Whether it is a directory-F: Whether it is a file-E: Whether the file or directory exists-R: Whether the current user has Read permissions-W: Whether the current user writes permissions-X: Whether the current

Original link: http://desheng666.blog.163.com/blog/static/4908408220121643953425/The expr command is generally used for integer values, but can also be used for strings. The General format is:Expr argument operator argumentExpr is also a manual

1. Get the name of the shell script${BASH_SOURCE-$0}2. Get the path to the shell scriptDirName "${bash_source-$0}"This path is not necessarily the true path of the script, for example, assuming that the command is in

In Linux systems, it is sometimes necessary to modify the IP address of the network card. In many cases, our maintenance of the Linux system is managed remotely (SSH), so that when the IP address changes, the connection between us and the server

1 , first to open HBase, Use JPS View ProcessJPS is the Java Process State tool, which returns the process ID and service name[Email protected]:~/apache/hbase-0.94.15-security$ JPS3082 NameNode6245 Hregionserver3493 Jobtracker6064 Hmaster5999

When a user logs on to a Linux system, the login shell executes the required script in the following order.First, execute/etc/profile this startup script, in/etc/profile This startup scripts will call all the startup scripts in the/ETC/PROFILE.D

650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M02/80/20/wKiom1c4dD-wFZx7AAAbgLBZiMU936.jpg "title=" Wkiol1cwdpjb1fbhaaabfqyv8vs885.jpg "alt=" Wkiom1c4dd-wfzx7aaabglbzimu936.jpg "/> First, the great cycle of the For loop

#!/bin/bash#check_file_md5 find/application/nginx/html/test1/-type F | Xargs md5sum >/tmp/web_md5_f.txt#check_file_num tree-i/application/nginx/html/test1 | Grep-v "^$" >>/tmp/web_md5_num.txt.defaultmd5= '/usr/bin/md5sum-c/tmp/web_md5_f.txt | Grep-v

For n in ' seq-w ' do pass= ' echo $RANDOM |md5sum| Cut-c 2-9 ' Useradd test$n echo $pass | passwd--stdin test$n echo-e "test$n \ t $pass" >>/tmp/user.logdoneNote:The-W usage of seqGeneration of random numbersCUT-C: intercepts the specified range of

ReferenceHttp://www.cnblogs.com/ggjucheng/archive/2012/10/21/2733028.htmlAdd a & after the command, such as Firefox &: Background execution.Jobs-l command lists How many commands are currently running in the backgroundCTRL + Z or send signal 17:

One. HIVE StreamingIn hive, when you need to implement a function that is not possible with a function in hive, you can use streaming to implement it. The principle can be understood as: using language other than the HQL statement, such as Python,

Linux Shell parameter substitution2013-06-03 10:01 by Xuan Blade, 1816 Read, 0 reviews, Favorites, compilation Bash in the符号的作用是参数替换，将参数名替

1. Check the host network card traffic#!/bin/bash#networkWhile:; DoTime= ' Date +%m '-"%d" "%k": "%m"day= ' Date +%m '-'%d 'Rx_before= ' ifconfig eth0|sed-n ' 8″p|awk ' {print $} ' |cut-c7-'Tx_before= ' ifconfig eth0|sed-n ' 8″p|awk ' {print $6} '

Simple needs to explain shell+expectInstall the Expect,yum installation firstYum Install Expect-y#!/bin/baship= ' 192.168.80.20 ' #定义远程交换服务器的IPpassword= ' [email protected] ' #定义输入的密码Expect Spawn ssh [email protected] $ip ls #在expect中执行命令Set Timeout-

Http://www.linuxidc.com/Linux/2012-04/59093.htmPeople often write and use makefile, makefile often use the shell, but some of them need to pay attention to the place is not necessarilyWill pay attention, here are listed a few come, do not know

Write a shell script that requires you to print a line that contains only a single number in the document:#!/bin/bashfor i in ' cat/root/passwd ';d o n= ' echo $i |sed ' s/[^0-9]//g ' |wc-c ' #echo $n if [$n-eq 2];then Echo $i else continue

The essence of the hill sort is the grouping insert sort, which is also known as narrowing the incremental sort.The basic idea of this method is that the whole sequence of elements is divided into several sub-sequences (consisting of elements

The Linux shell is much more powerful in programming than Windows batch processing, both in loops and operations. Data types are not comparable. Here's a summary of some of the things that an individual does when it comes to working with arrays.1.