Tag：Ending
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Time：2020-9-17
Assign a variable a newline character In Bash, if you want to assign a variable a newline character, write’\n’No effect, need to write as$’\n’。 Specific examples are as follows: $ newline=’\n’ $ echo $newline \n $ newline=$’\n’ $ echo $newline As you can see, putnewlineThe variable is assigned to’\n’What you get is\nThis string, not the […]
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Time：2020-8-21
Recently, reconfigure kubectl for AWS eks and record the configuration process. First, you need to configure awscli, and then configure kubectl’s config. Configure awscli To install awscli, python 2 version 2.6.5 + or Python 3 version 3.3 + is required. For centos7 installation of python3, please refer to the installation of Python 3.7.1 under centos7 […]
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Time：2020-7-23
Exception (2) Use try… Catch… To catch exceptions. If you can expect some exceptions to occur, you can use precise exceptions, such as “FileNotFoundException”, “directorynotfoundexception”, “IOException”, and so on. The general exception “exception” is most commonly used. using System; using System.Collections; using System.IO; namespace ConsoleApp5 { class Program { static void Main(string[] args) { try […]
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Time：2020-7-11
Topic requirements Consider the string s to be the infinite wraparound string of “abcdefghijklmnopqrstuvwxyz”, so s will look like this: “…zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcd….”. Now we have another string p. Your job is to find out how many unique non-empty substrings of p are present in s. In particular, your input is the string p and you need […]
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Time：2020-7-1
In idea, Maven can normally download jar packages to the local repository when they add dependencies to POM files. An exception occurred not long ago. After adding dependencies in POM, only the files with the end of. Lastupdated can be downloaded from the local repository. As shown in the figure Then I tried the online […]
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Time：2020-6-28
Title Requirements A sequence of numbers is called arithmetic if it consists of at least three elements and if the difference between any two consecutive elements is the same. For example, these are arithmetic sequences: 1, 3, 5, 7, 9 7, 7, 7, 7 3, -1, -5, -9 The following sequence is not arithmetic. 1, […]
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Time：2020-5-29
As a professional log collection and analysis system, sharplook Shylock involves many technical points from the back to the front, and the content is more complex. As a means of log parsing, regularization plays an important role. In this way, students can break up obscure content for learning. Previous review In the last article, we […]
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Time：2020-5-28
There are many executable files in bin directory: java.exe Running Java program is to start the JVM and let the JVM execute the specified compiled code; javac.exe Java compiler, which is used to compile java source files (ending with. Java suffix) into Java bytecode files (ending with. Class suffix); jar.exe : used to package a […]
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Time：2020-4-11
By default, centos6 64 bit already does not support php5.2. X, but some PHP programs need Zend optimizer support. What should I do? At present, most of Yum repos do not support the direct installation of php5.2. How to install php5.2 in centos6.x/6.5/6.4/6.3/6.2/7. X 64 bit (using Yum automatic installation) wget -qq -O – http://www.atomicorp.com/installers/atomic | […]
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Time：2020-3-16
In the bash shell of Linux,caseCompound command can execute the corresponding command when matching a specific pattern. Check the case command description in man bash as follows: case word in [ [(] pattern [ | pattern ] … ) list ;; ] … esac A case command first expands word, and tries to match it […]
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Time：2020-3-2
Requirement: it is composed of a number underscore () minus sign (-) and a letter, and it should contain both numbers and letters, and the length should be between 8-16 digits. /^(?=.*[a-zA-Z])(?=.*[0-9])[A-Za-z0-9-_]{8,16}$/g Note:^Match the beginning of a line(? =. * [a-za-z]) predicts that the position is followed by other characters and letters(? =. * [0-9]) […]
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Time：2020-2-27
In Bash, you can use control operators&Let the command run in the background, and then use thewaitThe built-in command waits for the task to complete. Control operator& See man bash for control operators&The description of is as follows: If a command is terminated by the control operator &, the shell executes the command in the […]
