Shell

Error One:The alias of the field cannot be used after Hive's where,Error Two:You cannot define a function in Hive's groupby, otherwise an error (replaced with a nested select)Error Three:When running: $./hive_game_operationstatis5.sh, the error

Since setting up a LNMP environment uses a step-by-step approach to installation is clumsy, the installation steps are written into a simple shell script, and most of the requirements can be achievedSuitable system version: centos6.5-6.7

Shell echo Command echo"It is a test"The double quotes here are completely omitted.3The . Display variable read command reads a line from the standard input and assigns the value of each field in the input row to the shell variable #!/bin/SH read

Vii. Process Control   conditional judgment control in bash Scripts   [] (the expression in [] is true)  && (the result of the front is true when executing the command behind)   | | (The result of the front is false when executing the command behind)

Objective:Shell + ansible + Gateone Automated operations Management: Minimal manual intervention, combined with the use of scripts and third-party tools to ensure that the business system 24x7 efficient and stable operation; 1. Installation

Ctrl+p repeat the last commandCTRL + a jumps to the first characterCtrl+x, but press again to return to the original position.Ctrl+b move forward one character without deleting the character caseCtrl+h Delete the previous characterCtrl+u all

The definition of the shell function is almost the same as the normal C language function.function () {｝The return value of the Shell function can be displayed, and if there is no return then the execution result of the last statement will be

One, read user input (1) The basic Read command accepts input from a standard input or file descriptor and assigns the received data to a variable.1 Cat read. SH 2 #!/bin/bash3# Test the Read command4echo" "5read name6echo"Hello $name "The-p

Write a script:1) display a menu to the user:d| D) show disk usages.m| M) show memory usages.s| S) show swap usages.QUIT|Q) quit.2) Display the appropriate content when the user is given an optionWhen the user chooses to complete, displays the

--stdin indicates that a standard input can be made with any fileExpect its main function is to add a shell to the SSH process to pass the interactive instructions.Its core is the spawn expect send setSpawn calling the command to executeExpect waits

Scripting features: Batch or single SSH-free login authenticationScript scenario: When deploying a cluster, most implementations want to configure the management node with SSH-free login from the node, writing the following script to simplify the

[email protected] 1]# cat mv.sh#!/bin/bashFor file in ' LS *.jpg 'Do/BIN/MV $file ' echo ' ${file%finished*}.jpg 'Done[email protected] 1]# LLTotal 8-rw-r--r--1 root root 106 Dec 05:33 A.log-rw-r--r--1 root root from Dec 05:39 mv.sh-rw-r--r--1 root

Transferred from: http://blog.chinaunix.net/uid-23046336-id-3475462.htmlPrograms programmed under Linux apes know shell scripts, and even if you're not familiar with them, you should have heard them! What about the dead loop in the shell script?For

Instance one: monitors the specified file status in the mounted directory, polls for one second, and the file is updated to be taken to the specified directory.1 #########################################################################2 #File

String interception of Linux is useful. There are eight ways.Suppose there is a variable var=http://www.aaa.com/123.htm.1. # Intercept, delete the left character, leave the right character.The code looks like this: Echo ${var#*//}where Var is the

DescriptionMultiple tomcat containers, while starting and shutting down, use pipework control for each Docker container's network management. This script is used to manage the creation, deletion, startup, and shutdown of multiple containers. The

When using Biber I usually follow the order of Pdflatex→biber→pdflatex→pdflatex, which are not an available option of Many IDEs.#! /bin/bash# # author:luglio# Date: -/ A/ -# Version:0.1.1# # prerequisites# LaTeX suite with Biber, sam2p# settings#

One, single branch if statement 1. Syntax formatif Then program fi or if [conditional judgment] then program fiNote: There must be a space between the brackets and the conditional judgments2. Example 1: Determine if the logged on user

OutlineFirst, the programming language classificationSecond, Shell classificationIii. Variables Related conceptsIv. Types of Bash variablesFive, logical operationSix, arithmetic operationsSeven, bash condition test type and test methodViii. the

Command: SortOption:-t:-kn Specifies that the order is sorted according to a segment here N represents a number, the range specifies n,n. range from N to n-N in numerical order-R Reverse Order-U go to repeat sort-un numbers are ordered and repeated,