Shell

FS ShellThe call file system (FS) shell command should use the form Bin/hadoop FS . All of the FS shell commands use URI paths as parameters. The URI format is Scheme://authority/path. For the HDFs file system, Scheme is HDFS, to the local file

Learn from this section the main control statements, loop statementsComments, Shell Multiline commentsThe Shell line comment is simple, just add # at the beginning of each line, but he does not provide a special multi-line comment method, so we use

Shell Foundation 1: File Security and PermissionsHttp://bbs.chinaunix.net/forum/viewtopic.php?t=434579&highlight=winggerAttached: Linux user and user group managementHttp://bbs.chinaunix.net/forum/viewtopic.php?t=438660&highlight=winggerShell Basics

1. {} curly braces:usage One: Wildcard extensionEg:ls my_{finger,toe}sThis command is equivalent to a combination of the following commands:ls my_fingers my_toeseg:mkdir {Usera,userb,userc}-{home,bin,data}we will get Usera-home, Usera-bin,

Linux Shell Script Raiders notesChapter II: Common Commands1. Cat cat-s//Multiple blank lines compressed into one cat *.txt | Tr-s ' \ n '//Remove blank line Cat-n//Gach No. 2, find goes down the file hierarchy, matches the qualifying file, and

Transferred from: http://cqfish.blog.51cto.com/622299/187188Article Source: http://hi.baidu.com/haigang/blog/item/e5f582262d639c118b82a167.html#!/bin/shMypath= "/var/log/httpd/"Myfile= "/var/log/httpd/access.log"#这里的-x parameter determines whether

In the process of writing a shell script, it is sometimes necessary to use some variable values are defined as (*) variables, but when we try to reference this variable, bash has the default to replace (*) the list of all the filenames in the

echo Display in shell script with color display, echo display with color, need to use the parameter-e format as follows: Echo-e "\033[word background color; text color m string \033[0m" Example: Echo-e "\033[41;36m something Here \033[0m "where 41

Rpm-q DHCP &>/dev/nullIf [$?-ne 0]ThenYum-y Install DHCPecho "Ddns-update-style Interim;Ignore client-updates;Option Domain-name-servers 192.168.1.1;Default-lease-time 21600;Max-lease-time 43200;">/etc/dhcpd.confFiWhile TrueDoRead-p "Please input

Some shell command tricks in log processingQuirks's log analysis, the future of the uncertainty of the day, the only thing that may also be a bit of a point is to manually handle a large number of logs. Sum up.The input to the log file is the text

1. Gets the return value of the Shell function call:#!/bin/sh info () { cat jlb.sh} res= ' info ' echo ' state: ' $?echo ' res: ' ${res}description : res='info' This behavior calls function info, which conforms to ' not single quotes, but the

In another blog "Shell script implementation DB2 database table export to a file" implemented through the implementation of the script to export the DB2 database to a file, need to pass in seven parameters, the last is a string with a space, so when

13th Chapter Landing EnvironmentWhen logging into the system, enter the user name and password, and if the authentication passes, enter the login environment.Logon processFile/etc/passwd$HOME. ProfileCustom $HOME. profile/etc/passwd file parsing

Classic Sort algorithm-Hill sort Shell sortHill sort Shell Sort is an improvement based on the insertion sort , which is also divided into two parts,The first part, Hill sort IntroductionThe second part, how to choose the keyword, the key is to

ArrayWhat array?An array is a collection that stores multiple storage units together continuously. In Linux, every storage unit in an array is called an array element. By default, the variable type of each array element is character. Therefore,

Bash supports many operators, including Arithmetic Operators, Relational operators, boolean operators, string operators, and file test operators. Native Bash does not support simple mathematical operations, but can be implemented using other

I originally wanted to write some shell scripts to train the trainer. I just wanted to give it a guess. so there will be a follow-up event. the most primitive guess script was first written. both functionality and aesthetics are unsatisfactory.

#! /Bin/basffe [$ #-EQ 0]; then Echo "the input value cannot be blank." // The system prompts that null values cannot be entered. Note: $ # indicates the number of environment variables exitfinum =* * // defines a global variable to facilitate the

[Shell Study Notes] curl command summary, shell Study Notes curlWen si haihui==============CURL command Summary1. DownloadCurl-o [file name] www.baidu.com2. Display HTTP request header informationCurl-I www.baidu.comShow HTTP response header

Shell script execution error & #39; \ 357 \ 273 \ 277 & #39;: commandnotfound Solution 1. Delete the BOM and execute the following command under vi. : Set nobomb 2. cause: The so-called BOM is the Byte Order Mark, which is a Unicode character