hadoop unix commands

under the use of Linux/unix, often using the text interface to set up the system or operating system, the author himself in the process of work is also in constant contact with this command, so for This special brewing, preparation, began the writing of this article. This paper mainly records some of their usual linux/unix under the operation of commands, record

Watch: regularly repeat Linux/Unix Commands The server administrator must maintain the system and maintain updates and security. Run a large number of commands every day. Some system processes record logs. These logs are constantly updated. To check for these updates, you must execute the command again. For example, to read a log file, you need to use

Introduction to Unix awk commands The most basic function of the awk language is to browse and extract information based on specified rules in a file or string. Only after awk extracts information can other text operations be performed, A complete awk script is usually used to format information in a text file. Call awk:First, the command line method, such as awk[-F field-separator]'

Fsck commands in Hadoop The fsck command in Hadoop can check the file in HDFS, check whether there is upt corruption or data loss, and generate the overall health report of the hdfs file system. Report content, including:Total blocks (Total number of blocks), Average block replication (Average number of copies), upt blocks, number of lost blocks,... and so on.---

Label: Ar strong SP Div on amp BS res File Collect the decompressed commands here and check them now. Haha . Tar Unpack: Tar xvf filename.tarPackage: Tar CVF filename.tar dirname(Note: tar is packed, not compressed !)---------------------------------------------. GZDecompress 1: gunzip filename.gzDecompress 2: gzip-D filename.gzCompression: gzip filename.Tar.gzDecompress: Tar zxvf filename.tar.gzCompression: Tar zcvf filename.tar.gz dirname-----------

After installing the mobile terminal found ping command, the route and other commands can not be used, prompt command not found.Workaround: Install the support packageShell-cmds Package: Contains Killall,mktemp, Renice, Time,which commandNetwork-cmds Package: Contains Arp,ipconfig,netstat,route,traceroute commandInetutils Package: Contains FTP,INETD,PING,RLOGIN,TELNET,TFTP commandAdv-cmds Package: Contains FINGER,FINGERD,LAST,LSVFS,MD,PS commandMobile

Common commands for clearing disk space in Unix/Linux Here we recommend several common methods for clearing disk space in Unix/Linux: Method 1: Find./-name "*. log *"-exec echo ">" {}\; | sh This command searches for the files ending with ". log" in the current directory and clears the files. This command is suitable for long-standing log and cannot be deleted di

(with?) to continue looking until you find it.For the first use VI, there are a few notes to remind:1. When you open a file with VI, you are in command mode, and you want to switch to insert mode to enter text. Toggle method: Click on the letter "i" "Command mode" to enter "Insert Mode", then you can start to enter the text.2, after editing, you need to switch from insert mode to command line mode in order to save the file, switch method: Press the "esc" key.3. Save and exit the file: Enter in

1. Test the speed of Hadoop writesWrite data to the HDFs file system, 10 files, 10MB per file, files stored in/benchmarks/testdfsio/io_dataHadoop jar Share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.6.0-tests.jar Testdfsio-write-nrfiles 10- FileSize 10MB2. Test the speed of Hadoop read filesRead 10 files in t

In Unix/Linux applications, we generally want to run a program in the background, so we usually use at the end of the program to make the program run automatically. For example, we want to run mysql in the background:/usr/local/mysql/bin/mysqld_safe-user = mysql . However, many programs do not want to use mysqld, so we need the nohup command. How can we use the nohup command? Here we will explain some usage of the nohup command. Nohup/root/start. sh

I am recently working on an iPhone text message upload and download project. After the text message is downloaded, I need to restart the SMS app to view the downloaded text message. However, in reality, it is impossible for users to restart the sms app, and all of them can only achieve the same effect in the code. Use unix commands to end the text message process. When the user returns to the text message

[Syntax]: mkdir [-M mode] [-p] Directory name[Note]: This command is used to establish the directory, the access mode of the directory is determined by the mask (umask), requires write permission to its parent directory, the UID and GID of the directory for the actual UID and GID-M Create directory in specified access mode-P establishes all of its nonexistent parent directories when the directory is created[Example]:mkdir tmp creating subdirectories in current directory TMPMkdir-m 777/TMP/ABC wi

1 PackageAlgorithms.util;2 3 /******************************************************************************4 * Compilation:javac Directory.java5 * Execution:java Directory directory-name6 * Dependencies:Queue.java Stdout.java7 * 8 * Prints out all of the files in the given directory and any9 * subdirectories in Level-order by using a queue. Also PrintsTen * out their file sizes in bytes. One * A *% java Directory. - * - *********************************************************************

When you are maintaining Oracle, you can use some Unix operating system commands to view system-related information under various operating systems. Memory ------- Aix:bootinfo-r LSATTR-E-LMEM0 /USR/SBIN/LSATTR-E-L sys0-a Realmem Or use a tool as "Topas" or "Nmon" (These are utilities) Linux:cat/proc/meminfo /USR/SBIN/DMESG | grep "Physical" Free (the free command) HP:/usr/sam/lbin/getmem grep me

name. So if you also encounter this error, please check that the user name, group name, and other settings are correct.After uploading, you will see committed revision 1. The words, the upload was successful. Congratulations to you here. But don't take it easy on your guard and let the other members test their read and write permissions. Please try it for a reference. Here are a few more you need to test I do not one to do.Test 2: Download code from server side to client local(Pending completio

A. Common Hadoop commands1. The FS command for Hadoop#查看hadoop所有的fs命令Hadoop FS#上传文件 (both put and copyfromlocal are upload commands)Hadoop fs-put jdk-7u55-linux-i586.tar.gz hdfs://hucc01:9000/jdkhadoop fs-copyfromlocal jdk-7u55-li

Hp unix has maintained a high market share in large enterprise-level hosts. For its top commands, I have read some documents before. Here I will summarize how to analyze the contents. 1.TopThe command syntax is as follows: Top [-s time] [-D count] [-q] [-u] [-H] [-N number] [-f filename] -S time: set the screen refresh latency, in seconds. The default value is 5 seconds. -D count: set the number of screen r

CPU time of the process) PRI Process Priority Scheme. A large number indicates a lower priority. Ni Nice value of the process, which is associated with the priority scheme. Enabling a process "nicer" means lowering the priority of the process so that it does not use up CPU time SZ The amount of virtual memory requested by the process. This is a good indicator of the system's memory requirements. Tty Start the terminal of the process (or parent pro

BKJIA: In this article, we will introduce six cool and practical Unix/Linux tools. From viewing the weather through your terminal to letting a system administrator teach you how to complete a difficult task, there is almost no clue. Interestingly, most of these tools were released decades ago! Please let me know ...... Mentoring dialogue: kibitz Kibitz is a terminal tool mainly used by a "master" to help him/her "apprentice )". Essentially, it provide

MAN: manual refers to the manual. You can use this command to query the usage of other commands. PWD: Print working directory indicates a password. Su: Switch the swith user to the root user. CD: Change directory switch directory Ls: List Files PS: Process status Mkdir: Make directory to create a directory Rmdir: Remove directory move directory Mkfs: Make File System: create a file system Fsck: File System check file system check C