Tag：not
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Time：2021-10-20
When – bash: host: command not found is displayed, we need to install the corresponding package The host program is in the bind utils package terms of settlement So install bind utils first Copy code The code is as follows: yum install bind-utils summary Many default packages will not be installed, so you must first […]
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Time：2021-9-14
You may have seen a “404 not found” reminder in the process of accessing web pages on your computer. What does 404 not found mean? How do I fix 404 not found? Let’s have a look. Visit the website to prompt 404 not found what to do 404 not found repair method: What does 404 […]
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Time：2021-9-7
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Time：2021-5-12
When using CentOS, you need to use FTP to upload files, but when you get to the FTP command of the script, you will make an error Copy code The code is as follows: ftp: command not found If the FTP client is not installed, you need to re install itThe solution is to go […]
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Time：2021-3-7
Yesterday, the company’s network replacement, and then in the use of GIT operation code, encountered the problem described in the title. Only in this paper, the solution process of the problem is recorded. First step: Get the IP address of this machine. Step 2: Ping The connection is normal. Step 3: Find the hosts file […]
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Time：2020-8-11
Some time ago, when I was doing a small function in the company, I counted the number of data in a certain situation and then modified the problem. At that time, I thought it was very simple. I wrote the following SQL: SELECT COUNT(*) FROM t1 where tl.c1 not IN (SELECT t2.c1 FROM t2); The […]
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Time：2020-4-18
Preface Recently, my colleagues found a problem: the buffer get in 12C is very high, but the buffer get in 10g is very low. Doubt there is a problem with the optimizer of 12C. In this 10g environment and 12C environment, the amount of data is roughly the same, but there are only a few […]
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Time：2020-4-13
Command not found solution for Linux timed tasks The first step is to view / etc / Profile: The second step is to modify / root /. Bash “profile: Add command path at the end Step 3: modify the shell script: #!/bin/bash . /etc/profile . /root/.bash_profile The following is added to the script: Thank you […]
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Time：2020-3-18
: not pseudo class selectors can filter elements that do not conform to expressions Example table tbody tr:not(:first-child):not(:last-child) td { text-align: right; } In the above code, you can select tr that is not the first and last in the tbody part of the table table, and set its sub element TD text style to […]
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Time：2020-1-17
Node.js prompt error: Error: EXDEV: cross-device link not permitted, rename ‘C:\Users\THEDIS~1\AppData\Local\Temp\upload_9b46f1afc2f9ade074037c3fb707d271’ -> ‘E:/node-rumen/tmp/test.png’ Error calling fs.renamesync method when uploading files This prompt is about the permission problem of cross region rename file. Resolvent First copy from the source file to the target file of another partition, and then unlink. form.parse(request, function(error, fields, files) { console.log(“parsing […]
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Time：2019-11-20
1. Function and grammar description Function: a regular expression uses a specified string to describe and match a series of strings that conform to a syntax rule. Many programming languages support string manipulation with regular expressions. Mongodb uses the $regex operator to set a regular expression that matches a string. Grammar 1 { <field>: { […]
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Time：2019-6-18
Often, colleagues ask how to deal with the operation not permitted error when deleting files/directories. This is generally a matter of authority, such as: 1. Ordinary users with sufficient privileges may use this folder by other services/processes. lsof +D /Dir/Your/Want/To/Delete/ First execute the above command, query the process IDs that call the folder, and then […]
