Shell

http://blog.csdn.net/gyanp/article/details/79030561) Format adjustment has the following parametersSet echo on/off displays the commands that need to be executed in the scriptSet feedback on/off indicates how many rows are returned after the select

Data import./hbase org.apache.hadoop.hbase.mapreduce.Driver Import table name data file locationHdfsThe data file location can be prefixed file:///Otherwise, the HDFs address is accessed.Data export./hbase org.apache.hadoop.hbase.mapreduce.Driver

Contains 3 types of data streams:• Standard input (stdin): code 0, Symbol or >>; standard error Output (STDERR): Code 2, Symbol 2> or 2>>. •>Default iscoverFile contents, if you want toAppendThen use>>Entering or outputting data from a specified

This article is part of the article "writing a Shell" series. In the previous article, we have completed the first step of our shell: the shell prompt. In this article, we begin to enable our Shell to start reading commands, and to do simple

Operations, shell scripts often encounter the legitimacy of determining the value entered, such as IP, email address, and so on. Then, according to their own script to summarize the judgment of IP legitimacy script to share to the netizen, when

StatsTo view the basic commands for the memcached status, this command allows you to see the following information:STAT PID 22459 Process IDSTAT uptime 1027046 server running secondsSTAT time 1273043062 Server current UNIX timestampSTAT version 1.4.4

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

Transfer from http://www.cnblogs.com/peida/archive/2013/03/18/2965369.htmlThe wget in a Linux system is a tool for downloading files, which is used at the command line. For Linux users is an essential tool, we often have to download some software or

01. Learn the knowledge storage required for Shell programming1.VI, VIM editor commands, VIMRC settings2. Command base, more than 100 commands3. Basic, high-end network services, Nfs,rsync,inotify,lanmp,sersync,sshkey batch distribution management02.

• Execute an error after importing scripts from Windows into a Linux systemshift parameter Left SHIFT commandHow to use functions in shellshell script Combat: MySQL automatic backup and automatic decompression zip file scriptError after importing

The format of the statement is: Getopts The general format is:Getopts option_string VariableWhere option_string contains a valid single-character option. If the getopts command finds a hyphen on the command line, it is compared with the word

Shell string manipulationThe bash shell provides several commands for string processing: awk command Expr command String length ${#..} Length of expr Length of awk (s)Instance:string= "Hello World"$ {#string}Expr

This is the original blog, reproduced please indicate the source: http://www.cnblogs.com/MrFee/p/4683953.html1, Appendtofilefunction: Appends the contents of one or more source file systems to the target file systemHow to use: Hadoop fs-appendtofile

6. History commandThe "History" command is a historical record. It shows the history of all commands executed in the terminal.7. sudo commandThe "sudo" (Super User Do) command allows authorized users to execute commands from Superuser or other users.

First, what is the shell?The shell is a command-line interpreter that provides users with an interface system-level program that sends a request to the Linux kernel to run the program, and the user can start, suspend, or even write some programs

Shell Script (iii)2. File sorting, merging and segmentation(1) Sort command#-c: The test file is sorted;-K: Specifies the sort field;-M: merges two sorted files;#-n: Sort by number size;-o: Writes output to file;-r: Reverses sorting results#-t:

1, $* and [email protected] DifferenceCat a.sh#!/bin/bashFor i in $* #这里换成 [email protected] same resultDoEcho $iDoneSH a.sh 1 ' 2 3 '123VI a.shFor i in "$*"...SH a.sh 1 ' 2 3 '1 2 3VI a.shFor i in "[email protected]"...SH a.sh 1 ' 2 3 '12

Wrote a script to view the APK signature with the shell. The code is very small and simple.Supports recursive directory queries#!/bin/bash# how to use the./getcertificate.sh xx.apkget_signature () {path= ' jar tf ' $ ' | grep RSA ' #查找apk中RSA文件 jar

First, what is a variableShell programming language is a non-type interpreted language, unlike the C++/java language programming requires the declaration of variables, the shell assigns a variable, in effect, it defines the variable, in all Linux

Common commands and statements for Shell programming (SCRIPT) and Common commands for shellSome common Shell programming (SCRIPT) commands and statements can meet general requirements.Command Parameters received: Number of parameters: $ #