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Linuxopsys Profile picture
@linuxopsys
May 14 • 40 tweets • 13 min read Twitter logo Read on Twitter
If you want to learn Linux for FREE, open this (a thread of our Linux threads): Image
1. Permissions

The operating system controls file access in Linux by utilizing file permissions, attributes, and ownership. In Linux, file permissions, attributes, and ownership determine the level of access that system programs and users have to files.

2. paste command in Linux explained

(simple yet powerful way to merge and organize data from multiple text files):

Learn more about the paste command in this master guide:

3. Basename command

The basename command in Linux prints the last element of a file path. This is particularly helpful in bash scripts where you only want the file name from a given file path.

Learn more in this thread:

4. pushd and popd

pushd and popd give you the ability to manage your directory stack and easily switch between directories, making them a must-have tool for any Linux user looking to maximize their efficiency and productivity:

5. Log parsing commands

Logs are a critical component of system and application management, providing valuable info for troubleshooting, performance analysis, security analysis, and compliance.

Learn more about the commands in this threads:
6. Learn about git

Most people who knoww Git think of it as a software project repository. It's actually more than that. It's useful for any type of file, but especially for config files that are updated on a regular basis.

7. Check memory usage in Linux:

As sysadmin or Linux power user in some cases, we may run out of memory, resulting in very slow response times or our server becoming unresponsive, and you will want to know how much memory is being used by the process.

8. Linux networking commands that every sysadmin should know:

9. User management

The useradd command is the main tool for adding new users to a Linux system.

This command allows you to quickly create a new user account and configure the user's $HOME directory structure

10. Easily search for files in linux

Knowing how to locate files in your filesystem is crucial for a developer or sysadmin.

Here are 7 Linux command-line tools to help you quickly and easily search files on your system:

11. usermod is a cmd-line tool for modifying a user's login details.

It is used to change the information of an existing user account, such as the username, user ID, home directory location, user groups, password, default login shell, and so on.

13. Wildcards explained

Wildcards are characters or groups of characters that enable you to create a pattern for searching or matching text on strings, filenames, or directories.

Let's dive into the topic ↓🐧

14. Linux absolute path and relative path explained:

In this thread, we will look at the important concepts of absolute path and relative path, which will allow you to navigate the file system without hesitation.

15. Linux guide

Learning Linux operating systems is an important skill for various computer science fields. Apart from cybersec Linux knowledge is also beneficial in software development, system admini, data science, and cloud computing, to name a few.

16. Bash scripting master guide

If you want to learn Linux bash scripting for FREE, open this:

17. Books you can read to learn and improve your Linux knowledge:
17. Process management

Knowing when and how to stop running processes is a essential skill for sysadmins. When a process becomes stuck, it only takes a gentle nudge to restart or stop it.

18. pidof command

pidof is a Linux command-line utility that returns the process IDs of a specific running program by its name.

Those IDs are printed on the standard output.

Learn more in this thread:
19. rsync command

As a sysadmin or Linux power user, how do you transfer files from your local system to a remote?

To synchronize directories or files to another machine we need a fast and reliable tool.
20. File compression

How to compress and decompress files in Linux using gzip command🐧 ↓

21. cat command

99.9% of Linux users use the cat command every day.

Despite this, most people do not take advantage of its full potential.

In this thread, I'll explain what the cat command:

22. Linux shells:

Bash is not the only shell available in Linux.
Here are a few more you should probably be aware of:

23. paste command in Linux explained

(simple yet powerful way to merge and organize data from multiple text files):

Image
24. Text manipulation commmands:

16 Basic Linux commands for text manipulation (save this)🧵↓
25. Distructive linux commands:

12 destructive Linux terminal commands every Linux user must be aware of (don't run these):

26. Linux directory structure explained:

The Linux operating system is known for its flexibility and robustness. One of the core components of the Linux operating system is its filesystem.

Lets dive into it:
27. Linux boot process

When you turn on your Linux computer, it goes through a series of phases before presenting a login screen that prompts you for your username or password.

Continue to read:
28. grep command

In the Linux command line, the grep command is a powerful tool for searching text within files.

Here are 11 examples of grep command usage that every Linux user, sysadmin, and developer should be familiar with 🐧 ↓

29. find command examples:

13 useful Linux find command practical examples 🧵↓
30. find command master guide

The Linux find command is a powerful tool that allows system administrators to search for and manage files and directories that match a set of criteria in the filesystem.

31. Last command in Linux explained

When managing a multiuser system, you'll frequently need to know who, when, and from where people are logging in.

last is a utility that displays information about system users' most recent login sessions.

32. Linux shell scripting basic - changing directory in shell scripts

You may want to run a shell script that changes your current working directory to another directory for convenience.

33. Understading the passwd file

Understanding the /etc /passwd file is important for managing users in Linux. The /etc/ passwd is a plain text file that contains all the crucial information for all system user accounts needed when logging in.

34. Everything you need to know about copying files in Linux (Linux basics)

As a system administrator, you will frequently need to copy files and directories from one location in the filesystem to another. The cp command makes this possible.

35. Understanding the /etc/ shadow file in Linux

As a Linux super user understanding the /etc/ shadow file is very crucial for managing Linux users.

Continue to read:
36. Input, Output, and Error Redirection in Linux

Most Unix/Linux system commands accept input from your terminal and return the resulting output to it.

A command normally reads its input from the standard input, which is usually your terminal.

37. Background Linux commands

When you run a command in the terminal, you usually have to wait for it to finish before entering another one.

This is referred to as running the command in the foreground or typically a foreground process.
38. 10 Linux tr command practical examples you should know as a system administrator (bookmark this):

That's it for today's thread.

Thank you taking your time to read it.

If you enjoyed this thread, follow us @linuxopsys for future Linux posts, which we will be posting on a daily basis.

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More from @linuxopsys

Linuxopsys Profile picture
May 11
An awesome infographic to help you understand DevOps concepts: Image
Stage 1 - Plan

In this stage, teams determine the business requirement and gather end-user feedback. During this stage, they develop a project roadmap in order to maximize business value and deliver the desired product.
Stage 2 - Code

At this stage, code development takes place. To avoid security flaws and poor coding practices, development teams use tools and plugins such as Subversion, Git etc. to streamline the development process.
Read 11 tweets
Linuxopsys Profile picture
May 8
The operating system controls file access in Linux by utilizing file permissions, attributes, and ownership. In Linux, file permissions, attributes, and ownership determine the level of access that system programs and users have to files.

Learn more about Linux file permissions Image
This ensures that only particular directories and files are accessible to authorized users and processes only.
Having knowledge of the Linux file system permissions structure enables you to restrict access to files and directories to only authorized users and processes, hence increasing the level of security of your system.
Read 25 tweets
Linuxopsys Profile picture
May 5
paste command in Linux explained

(simple yet powerful way to merge and organize data from multiple text files):

Learn more about the paste command in this master guide: Image
The paste command merges lines of files horizontally by combining corresponding lines from each file specified as an argument and separating them with tabs.

In this thread, we will guide you on how to utilize the paste command effectively.
How to use the paste Command

The paste command is not as commonly used as other Linux and Unix command-line utilities, but it can be incredibly useful.

The paste command has the following syntax:

$ paste [OPTION]... [FILE]...
Read 22 tweets
Linuxopsys Profile picture
May 3
The basename command in Linux prints the last element of a file path. This is particularly helpful in bash scripts where you only want the file name from a given file path.

In this thread, we will look at various examples to help us understand the basename command in Linux: Image
The "basename" function takes a filename and prints the last portion of it. If necessary, it can also remove any subsequent suffixes.
[+] Basename command syntax:

The basename command supports two syntaxes:

$ basename NAME [SUFFIX]
$ basename OPTION... NAME...
Read 14 tweets
Linuxopsys Profile picture
May 3
The basename command in Linux prints the last element of a file path. This is particularly helpful in bash scripts where you only want the file name from a given file path.

In this thread, we will look at various examples to help us understand the basename command in Linux: Image
The "basename" function takes a filename and prints the last portion of it. If necessary, it can also remove any subsequent suffixes.
[+] Basename command syntax:

The basename command supports two syntaxes:

$ basename NAME [SUFFIX]
$ basename OPTION... NAME...
Read 14 tweets
Linuxopsys Profile picture
Apr 30
pushd and popd are very underutilized commands, yet incredibly powerful.

These cmds give you the ability to manage your directory stack and easily switch between directories, making them a must-have tool for any Linux user looking to maximize their efficiency and productivity Image
In this thread, I'll show you how to use the pushd and popd commands to unlock the power of easy system directory navigation and streamline your workflow.
First let's understand what a Directory Stack is?

The Directory Stack is an ordered list of directories that have been accessed during navigation.

The contents of the Directory Stack can be viewed through the execution of the dirs command.
Read 29 tweets

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