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 # #

Now, based on the development of Linux, Internet products are basically based on Linux,android,mac, Linux everywhere, so, as a time-tested, not familiar with Linux is not good, record some of the common shell commands in the test.1, LS: Print out

Loop of shell scripts: repeating commands1.for CycleGrammarFor variable name in variable Value listDoCommandDoneFor based on the contents of the variable Value list, executes the command repeatedly until all the contents of the Variable Value column

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

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

Create multiple catalogs at once[Email protected] tmp]# mkdir-p/user/{folder1,folder2,folder3} [[email protected] tmp]# Ls/user/folder1 Folde R2 Folder3Find the largest 10 directories in the root directory and sort them from large to small by using

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:

Format: echo "/033[word background color; font color m string/033[control code"If you simply display the font color can be fixed control code bit 0m.Format: echo "/033[word background color; font Color m string/033[0m"Note:1, the word background

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

The main contents of this section:Top command to count CPU utilizationOne, problem analysisMySQL is multi-threaded under Linux and can only distribute multiple threads to a single CPU.Therefore, using a small server, or PC server, multiple CPU

#!/bin/bash # # ip_check    This shell script takes care of checking all IPAddress. # # Create by Xuekun # date 2015-12-6 # Beijing Open Source # source function library. ./etc/rc.d/init.d/functions App_path= ' pwd ' Log_path=${app_path}/ip_

1, in three ways to achieve delete the last line of the file.[[email protected] sjx]# cat 123123[[email protected] sjx]# sed ' $d ' 12312[[email protected] sjx]# cat 123 |head-$[$ (cat 123|WC-L) -1]12[[email protected] sjx]# cat 123 |sed-n ' $!p ' 12

Monitoring ideas, Architecture introductionRequirements: Use the shell to customize a variety of personalized alarm tools, but the need for unified management, standardized management. idea: Specify a script package that contains the main program,

Seq Command IntroductionUse:Seq-print a sequence of numbersGrammar:seq [OPTION] ... Lastseq [OPTION] ... First Lastseq [OPTION] ... First INCREMENT LastCommon options-S,--separator=stringUse STRING to separate numbers (default: \

1) If you want to search the file name beginning with AB,#find/-name "ab*", pay attention to double quotation marks, or you will get an error.If you search a file, AB starts the sentence,#grep "^ab" file name , if using cat, is to show the full text.

#批量修改当前目录下的文件扩展名, change. doc to. txt1. [email protected] rendir]# vim. /renfilex.sh2. #!/bin/bash3. For FILE in "$"4. Do5. mv $FILE ${file%$1} "$"6. Done++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++Write a

Today, let's introduce some common shell commands in the Mac Terminal:1. View the full path to the current working directoryPwd(PWD's original intention is: Print work directiory, not password password meaning, hehe)2. View the command's detailed

[[email protected] ~]# mkdir shell[[email protected] ~]# cd shell/[[ email protected] shell]# vim first.sh#!/bin/bash                                 must be # #the  first test shell script.             Description # #written  by guozhen.mkdir 123   

This article mainly describes how to use bash to implement a basic thread pool.1. Pre-knowledge {}& in Linux means the entire block of code is put into the background execution The wait Wait command indicates that all background

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.