Shell

first time blogging to share some recent work imagenet Introduction Imagenet is currently the world's largest image recognition of the database, the database contains a large number of image information, and these images have a basic tag information,

1. Introduction Use in shell programming to determine parameters within the IF statement–b returns True when file exists and is a block file-C Returns True when file exists and is a character file-D returns True when pathname exists and is a

1. Write at the beginning Recently in the study Bang Bang shell, in the process of debugging encountered reverse debugging, is very distressed, and every debugging will be interrupted, a friend sent a post "1" introduced one of the Anti-tune, after

#!/bin/sh foo () { If [$#-ne 1]; Then echo "usage:$0 filename"; Exit-1 fi egrep-o "http://[a-za-z0-9." +\. [A-za-z] {2,3} "website | awk ' {count[$0]++} END {printf ("%-30s%s\n", "Wensite", "Count"), for (Ind in count) {printf

You can't write this in Sh/bash, and if the Else branch doesn't have a statement execution, don't write this else.If ElseifIf statement syntax format:If conditionThenCommand1Command2...CommandNFiWrite a line (for the terminal command prompt):If [$

Shell special characters: 1. Wildcard character 2. Piping1. Wildcard characters1.1 asterisk (*): matches any length1.2 Question mark (? ): Matches a length of characters1.3 square brackets ([...] ): matches the character specified in it1.4 Square

The use of Springboard machine only to do SSH relay, in order to strictly control the data entry and exit of the Springboard, command management, special access to the springboard operation to restrict management. The script contains two interface

Objective　　After installing CDH and Coudera Manager offline, all of your own apps are installed through Coudera Manager, including HDFs, hive, yarn, Spark, hbase, and so on, and the process is a twist, so don't complain and go straight to the

1. basic usage of shell variables and usage of common symbolsThis section requires writing out the shell commands that implement the requirements, showing(1) Change the main prompt to the user's home directory name(2) Assign the string DOS file c:>\

#!/bin/bash##################################################################### auto install  BIND#CREATEDATE:2018-05-31#WRITTENBY&NBSP: Wind Flower # organization:   hbgslz.com###################################################################

The shell has a shell meaning, which provides the platform for the user to interact with the kernel, and the kernel then implements the functionality through the underlying system call. Features of the Linux shell:1. Shortcut: Ctrl + A (ahead) move

A shell function is a set of command sets or statements that make up an available block. Using functions can simplify scripting. The function requires that the function be defined and reused, and that it is used directly when calling the functions.

SHELL:An interface program that completes the interactive operation between the user and the operating system, providing the user with simplified operation;In the middle of the 70 's, Bell Lab, Bourne;bourne Shell, abbreviated Sh;bill JOY:C Shell,

1. Position variable(1) $ ==> Take file name[email protected] ~]# cat test.shEcho[Email protected] ~]# sh test.shtest.sh[Email protected] ~]# sh ~/test.sh/root/test.shDescription: When executing a script, the script name is preceded by a path to the

1.Shell determine the user's parametersWhen the system executes the mkdir command, it will judge the information entered by the user, that is, whether the user-specified folder name already exists, if there is an error, and the other is

variable names do not add dollar signs when defining variables, such as:# Myname=sxzhouAttention:There can be no spaces between the variable name and the equals sign, which may be different from any programming language you are familiar with. At the

Odd number of LikesLife is not as good as the ten, but there are no two or three people with the prophets. Fortunately, we were born in the internet era, the reality can not find to talk to people can also be found in the network of emotional vent,

Shell Alarm System Demand:Use Shell to customize a variety of personalized alarm tools, unified management, standardized management; Ideas:Specifies a script package that contains the main program, subroutine, configuration file, mail

Tag: Class begins with regular expression find parenthesis expression matches between awkRegular expressions and wildcard characters:1. The regular expression is used to match the qualifying string in the file , and the Regex contains the match .

The VI editor has three status modes "VI file name (or path + file name)"1. Command mode2. Input mode3. Last-line modeConversion between three modesVi. start and exit of the VI editorGo directly to the editing environment$ VIEnter the editing