Shell

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-linux-i586.tar.gz

2.shell Tools2.1. log filesBrief introductionIt is important to create a log file, which records important information. In the event of an error, this information is very useful for our troubleshooting, and the monitoring information can be logged

There are a lot of uses for the For loop in the shell, and I've been trying to summarize what I saw on the web today about the for loop usage.Knot, feel very comprehensive, so turn around research and research, hey ...1, for ((i=1;i2. Common in

Typically, as a deployment script for an application, the first task that begins is to create a dedicated (dedicated) user and user group for the current app. This script is very simple, a reference sample is attached

1. Determine the logged-on user1.1 Scripts[Email protected]_1 shell]$ VI check_user.sh#! /bin/shecho "You is logged in as ' WhoAmI '"; if [' whoami '! = Devtac]; Then echo "must is logged in as Devtac-to-run this script." Exitfiecho "Running

The logical operators of the shell involve the following types, so as long as the appropriate choice, can solve our many complex judgments, to achieve a multiplier effect.First, the logical operator Logical Volume Label Express

The function of quotation marks1 double quotation marks ("")1) Use "" To reference any character or string except the character $ (dollar sign), ' (anti-quote), \ (backslash). Double quotation marks do not prevent the shell from special handling of

Method 1:Use Linux iconv to convert the Utf-8 log to GBK encoded file, and then gbk the statistics in the environment. UTF8 () { log_file= "/lcims/crontab_shell/outfile/lan_wlan_wo/socketmain.log141114_lan1" LOG_FILE_TMP= "/

Article Source: (Linux Shell) The first chapter--Small trial sledgehammer (next)1.6 Arrays and associative arrays1.6.1 Preparation KnowledgeBash supports both normal and associative arrays, and normal arrays can use integers only as an array index,

Project structure such asOne: System environmentThis machine: 10.4.18.3Server: 10.4.18.4, user name: WEB02Two: Initializing the server environmentCreate a directory on the server's home directory Deploy,deploy/profileMkdir-p/home/web01/deployMkdir-p/

Duang~~~ has industry insiders, peanut shell intranet version will be online more than a router? If the message is true, then the user with the intranet IP address can be completely through the router settings to solve the remote access and

Today, the company LD asked to write a small script to monitor whether a process exists and how to exit the script. If it does not exist, send an email to the specified mailbox, I use the running status of the daemon to determine the connection

Overview The file system (FS) shell contains various commands for interacting with HDFS, such as local FS, hftp FS, S3 FS, and other. FS shell. Run the following command: Bin/hdfs dfs Path URI can be used as a parameter for all Fs shells. The URI

SET commandIt can be used to customize the shell environment and use the option "O" to enable or disable the option. For example, enable option: set-O option, and disable option: Set + O. Shopt commandIs an alternative to the set command, which is

Simple example shell program Example 1. #!/bin/bash#This is to show what a shell script looks likeecho "Our first example"echo # This inserts an empty line in output.echo "We are currently in the following directory."/bin/pwdechoecho "This

#! /Bin/bash # Returning an array value Function arraydblr () { Local origarray Local newarray Local Elements Local I Origarray = ('echo "[email protected]" ') Newarrray = ('echo "[email protected]" ') Elements = $ [$ #-1] For (I = 0; I { Newarray

As mentioned above, variable names can only contain numbers, letters, and underscores, because some variables that contain other characters have special meanings. Such variables are called special variables. For example, $ indicates the ID of the

Shell Programming Application-automated website backupRsync is a data image backup tool in unix-like systems-remote sync. A Fast Incremental Backup Tool, Remote Sync, supports local replication or synchronization with other SSH and rsync hosts.

Getting started with Shell programming (version 2) (medium) and getting started with shell programmingVariable test statement-test Purpose: test whether the variables are equal, empty, and file type. Format: Test condition or [] # range: integer,

Shell script automated testing framework, shellscript Development background of shUnit2 ShUnit2 is developed based on the log4sh SHELL automated testing. It is used in a similar way as JUnit. Preparation 1. Download shUnit2 Wget-P ~ /Download http://