JIYIK CN >

This article is a part of the ongoing series of Awk tutorials and examples. Like any other programming language, Awk also has user-defined variables and built-in variables. In this article, let's review how to define and use awk variables....

In our previous article in the iptables firewall series, we reviewed how to iptables -A add firewall rules using . We also explained how to allow incoming SSH connections. At a high level, it involves the following 3 steps. Delete all exist...

I rarely use it man pages , because searching for the syntax or specific flags of a command is much faster than browsing through a lot of information we may not need. However, I found a package that summarizes the output of the man pages an...

It's strange that there's no default GUI provided for us to update the scroll speed on Ubuntu, this is one of the more obvious configuration options missing. We will use imwheel to adjust the scroll speed of different applications. First cr...

Commonly used terminals on Mac are terminal and iterm. In many cases, we need to modify the host name displayed in these terminals. As shown in the figure above, we use the command hostname to view the current host name From the results we...

Adding and removing users on a Linux system is one of the most important system administration tasks we need to be familiar with. When a new system is created, usually only the root account is accessible by default. While running as the roo...

Nginx is one of the most popular web servers in the world, responsible for hosting some of the largest and most trafficked sites on the Internet. It is a lightweight application software that can be used as a web server or a reverse proxy....

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...

You can use yum to install it under Linux $ yum install supervisor After installation, add the startup $ systemctl enable supervisord Finally, start the supervisor service $ systemctl start supervisord...

Problem 1: Android cannot send network requests There was a problem when cordova was packaging Android. After packaging, it was impossible to send a request (whether it was http or https). In the end, I had to delete the original project an...

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...

I upgraded my Windows 7 32-bit operating system to a 64-bit operating system, and the previous PHP environment also needed to be reconfigured. Previously, I used apache2.2 and php5.3. Since I upgraded the operating system, I also upgraded t...