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Old Boy’s Exploration：Deep Dive into linux Advanced Features
Linux, as a stable , robust and user-friendly operating system, is widely used in industries. behind the simple appearance, a large number of advanced features are hidden deep down, providing strong support for many powerful applications. As an old boy in the Linux world, I am really interested in exploring these advanced features.
Firstly, Linux offers a variety of permission options which can be adjusted to ensure more secure access. For example, if configure the permission of a file or a directory as 644, only the owner of the file can have the write permission of that file. This can be implemented with command such as “sudo chmod 644 filename.txt” or “chown username:groupname filename.txt”. In addition, access control lists (ACL) can be used to define user-specific access control policies for a file or a directory.
Apart from that, Linux provides a rich set of commands for system administration and maintenance. Some of those commands are related to networking. For example, the “ifconfig” command can be used to show information about network interfaces. Additionally, “iptables” command is used to configure the firewall. With those commands, complicated network configurations can be implemented without too much effort.
Furthermore, Linux is highly scriptable and it is possible to automate management and system maintenance tasks using a scripting language such as Bash or Python. By combining multiple commands and setting them as a script, Linux can be used to quickly implement large scale systems. As an example, the following is a simple bash script for checking the status of a system component:
#!/bin/bash
status=$(/bin/ps -ef | grep service_name | grep -v “grep”)
if [ “$status” -ne “” ]
then
echo “Service is running.”
else
echo “Service is not running.”
fi
Finally, Linux supports the kernel modules which enables Linux to be plug-and-play ready. They are like blocks of code that can be added to the kernel to support new devices or modify system behavior at run-time. A kernel module can be loaded and unloaded dynamically without rebuilding the whole kernel. This helps to keep the Linux system up-to-date and also make it easier to add custom features to the system.
To sum up, I have explored this article the advanced features of Linux from the aspects of permission, command line tools, scripting and kernel modules. Above-mentioned example clearly show that powerful capabilities are always hidden behind the simple user interface of Linux. I believe the exploration of Linux will never stop and will left up many secrets.
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名稱欄目：特性的探索老男孩的探索：深度挖掘Linux的高級特性（老男孩linux中高級）
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