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Scp copies files between two hosts over the network, and the data is encrypted during transmission. Its underlying layer uses ssh for data transmission. And it has the same authentication mechanism and the same security level as ssh. When u...

Since we want to delete the files under the directory regularly, we need to use the Linux crontab command. And the content format of each work routine is also introduced in the format of each crontab work. Similarly, we need to use shell sc...

Compared with at , which executes a command only once, crontab, which we are going to talk about in this article, executes the set commands in a loop. Similarly, the use of crontab requires the support of the crond service. The service is s...

This article mainly involves a knowledge point, which is the atd service. Similar to this service is the crond service. The functions of these two services can be similar to the two functional functions of javascript. Those who have learned...

Usually, in Linux system we need to frequently delete some temporary files or junk files. If we delete them one by one manually, it will be quite troublesome. I have also been learning shell script programming recently, so I tried to write...

In shell script programming, predicates are often used. There are two ways to use predicates, one is to use test, and the other is to use []. Let's take a look at how to use these two methods through two simple examples. Example 1 # test –...

? is a special variable. This variable represents the return value of the previous command. That is to say, when we run certain commands, these commands will return a code after running. Generally, if the command is successfully run, the re...

In Linux, the best editor should be vim. However, the complex commands behind vim's powerful functions also make us daunted. Of course, these commands do not need to be memorized by rote. As long as you practice using vim more, you can reme...

A lot of software found today is in the tar.xz format, which is a lossless data compression file format that uses the LZMA compression algorithm. Like gzip and bzip2, it supports multiple file compression, but the convention is not to compr...

As the most commonly used web server, Apache can be used in most computer operating systems. As a free and open source Unix-like operating system, Linux and Apache are a golden pair. This article will introduce the installation and use of A...

Generally, the configuration files of supervisor are /etc/supervisord.conf . The directory where tasks are stored is /etc/supervisord.d , and you can create a new file named yourname.ini under this directory. Each .ini file is a task, and w...

On a Mac, you may encounter the following error when using gdb for the first time: (gdb) run Starting program: /usr/ local /bin/order_monitor Unable to find Mach task port for process-id 26551: (os/kern) failure (0x5). (please check gdb is...

The xargs command is also a member of the pipeline command. The function of the xargs command is simply to replace parameters. So what is parameter replacement? First, we need to understand the concept of pipelines. In the section on Linux...

Linux classic practice - log filtering Let's talk about the problem first. Count the number of IP addresses in a log file after deduplication. In fact, this is a very common and relatively simple problem. I personally think that the most im...

1. Add a rule to allow access to a port $ iptables -A INPUT -p tcp --dport 3005 -j ACCEPT Add a rule and append a rule to the INPUT chain to allow access to port 3005. The rules added in this way are only temporarily saved in the memory and...