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Add Users and Groups Manually
This section provides a tutorial example on how to add users and groups manually on Linux computers.
2022-10-01, ∼191🔥, 0💬

"free" - Display Free and Used Memory
This section provides a tutorial example on how to display free and used memory information using the 'free' command on Linux systems.
2022-10-01, ∼190🔥, 0💬

"jobs" - Manage Background Jobs
This section provides a tutorial example on how to use 'jobs' command to display background jobs, which are processes with input detached the keyboard. You can start a background job by adding the 'ampersand' sign to the end of the commmad.
2022-10-01, ∼190🔥, 0💬

/proc/{id}/smaps - Process Memory Map Details
This section describes the pseudo file '/proc/{id}/smaps' that represents virtual memory map of a given process with detailed information on each mapped area.
2024-08-17, ∼189🔥, 0💬

"du" - Display Disk Usage of Directories
This section provides a tutorial example on how to use 'du' command to display disk usage of any given directories on Linux systems.
2022-10-01, ∼189🔥, 0💬

"last/lastb" - Review Login History
This section provides a quick introduction of the 'last' and 'lastb' commands, which allows you to review login history and login attempts.
2023-12-28, ∼187🔥, 0💬

Support FTP Over TLS on CentOS
This section provides a tutorial example on how to turn SSL/TLS support in vsftpd server on CentOS systems. A private-public key pair and a self-signed certificate is generated with the OpenSSL tool.
2024-01-03, ∼186🔥, 0💬

"df" - Display Free Space of File System
This section provides a tutorial example on how to use 'df' command to display free spaces of mounted file systems on Linux systems.
2022-10-01, ∼185🔥, 0💬

"sudo" Command and Privilege
This section provides a tutorial example on how to grant 'sudo' privilege to a user to allow him/her to run 'sudo' command to gain 'root' permission without login as 'root'.
2022-10-01, ∼183🔥, 0💬

Cron Daemon, Table and Jobs
This section describes what is cron daemon and its related cron tables/jobs.
2022-10-01, ∼182🔥, 0💬

"more", "head" and "cat" - Read Files
This section provides a tutorial example on how to use 'more', 'head' or 'tail' commands to read text files one screen at a time, to read the first 10 lines, or to read the last 10 lines.
2022-10-01, ∼182🔥, 0💬

Requirements for Supporting HTTPS on Apache
This section provides a brief summary of requirements on configuring the Apache HTTP Server to support the HTTPS protocol.
2024-04-12, ∼181🔥, 0💬

Group Access Permissions on Files
This section provides a tutorial example on how to control group access permissions on files. Use 'chgrp' to change group ownership. Use 'chmod g=' to change group access permission.
2022-10-01, ∼181🔥, 0💬

SquirrelMail Configuration for SMTPS Port 465
This section provides a tutorial example on how to configure a SquirrelMail Webmail site to use the secure SMTPS port 465 to send out emails through a mail server on a local network.
2023-07-10, ∼180🔥, 0💬

"xz/unxz" - Compressed *.xz or *.lzma Files
This section provides a tutorial example on how to use 'xz' and 'unxz' commands to compress large files and restore them later. Compressed files will have the *.xz file name extension.
2022-10-01, ∼180🔥, 0💬

vsftpd Server Configuration
This section provides a tutorial example on how to configure vsftpd server to allow some local users to upload and download files in their own private Directories with FTP client programs.
2024-01-03, ∼179🔥, 0💬

SquirrelMail - Webmail in PHP
This chapter provides introductions and tutorial on SquirrelMail Webmail. Topics include installing and configuring SquirrelMail on CentOS systems; accessing mail server on local network; accepting self-signed certificate; using secure IMAPS and SMTPS ports 993 and 465.
2023-06-14, ∼179🔥, 0💬

"jobs" - Manage Background Jobs
This section provides a tutorial example on how to use 'jobs' command to display background jobs, which are processes with input detached the keyboard. You can start a background job by adding the 'ampersand' sign to the end of the commmad.
2022-10-01, ∼179🔥, 0💬

Dovecot - IMAP and POP3 Server
This chapter provides introductions and tutorial examples about Dovecot - IMAP and POP3 Server. Topics include installing, configuring, and starting Dovecot; testing Dovecot server using POP3 and IMAP commands with 'telnet'.
2022-10-01, ∼179🔥, 0💬

"who | w" - Logged-in Users and Their Running Commands
This section provides a tutorial example on how to display logged-in users and their running commands using 'who' and 'w' commands on Linux systems.
2024-08-17, ∼178🔥, 0💬

What Is Apache HTTP Server "httpd"
This section provides a quick introduction of Apache HTTP Server, also referred as HTTP daemon or httpd.
2024-04-12, ∼178🔥, 0💬

Test FTP Access Remotely on CentOS
This section provides a tutorial example on how to update firewall on the vsftpd server (and its firewall gateway if it is served in the cloud) to open ports 21 and 30000-31000 for inbound connections.
2024-01-03, ∼178🔥, 0💬

"wget" - Get Files from the Web
This section provides a tutorial example on how to use 'wget' command to download files from the Web. 'wget' can resume failed downloads.
2023-05-23, ∼178🔥, 0💬

"find" - Search for Files
This section provides a tutorial example on how to use 'find' command to search for files in a directory tree. '-name' and '-size' are 2 commonly used search conditions.
2022-10-01, ∼176🔥, 0💬

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