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"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, ∼229🔥, 0💬

Cron Daemon, Table and Jobs
This section describes what is cron daemon and its related cron tables/jobs.
2022-10-01, ∼228🔥, 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, ∼227🔥, 0💬

What Is RPM
This section provides a quick introduction on RPM (RedHat Package Manager), which is a free and open packaging system on Red Hat Enterprise Linux as well as other Linux and UNIX systems.
2022-10-01, ∼227🔥, 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, ∼226🔥, 0💬

"compress/uncompress" - Compressed *.Z Files
This section provides a tutorial example on how to use 'compress' and 'uncompress' commands to compress large files and restore them later. Compressed files will have the *.Z file name extension.
2022-10-01, ∼226🔥, 0💬

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, ∼225🔥, 0💬

Performance Comparison of Inserting Integers vs. Strings
This section provides a tutorial example on how to check performance comparison between inserting integers and inserting strings to MySQL database.
2022-10-01, ∼225🔥, 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, ∼224🔥, 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, ∼222🔥, 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, ∼222🔥, 0💬

"tar -c" and "tar -x" - Create and Extract Archive Files
This section provides a tutorial example on how to use 'tar -c' command to compress multiple file and sub-directories into an archive file and use 'tar -x' command to extract files out of an archive file.
2022-10-01, ∼222🔥, 0💬

Postfix - Mail Transport Agent (MTA)
This chapter provides introductions and tutorial examples about Postfix - Mail Transport Agent (MTA). Topics include installing, configuring, and starting Postfix; testing Postfix using STMP commands with 'telnet'; turn on 'SMTP Submission' and 'SMTPS' services; using 'postconf' command.
2022-10-01, ∼221🔥, 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, ∼220🔥, 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, ∼219🔥, 0💬

Thunderbird Configuratin for SMTPS Service
This section provides a tutorial example on how to configure Thunderbird use SMTPS (SMTP with SSL/TLS) service to securely sending out new emails.
2022-10-01, ∼218🔥, 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, ∼217🔥, 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, ∼215🔥, 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, ∼215🔥, 0💬

"zip" and "unzip" - Create and Extract ZIP Files
This section provides a tutorial example on how to use 'zip' command to compress multiple file and sub-directories into a ZIP file and use 'unzip' command to extract files out of a ZIP file.
2022-10-01, ∼215🔥, 0💬

Apache Configuration for HTTPS Protocol
This section provides a tutorial example on how to install Web server certificates and configure Apache HTTP Server to support the HTTPS protocol.
2024-04-12, ∼214🔥, 0💬

"apachectl status/start/stop" Commands
This section provides a tutorial example on how to use 'sudo apachectl *' commands to control the Apache HTTP Server, httpd.
2023-05-29, ∼214🔥, 0💬

MySQL Server Data Backups on CentOS
This section provides a tutorial example on how to create backups of MySQL databases and load it back to another MySQL server for MySQL 8.0 server on CentOS 8 systems.
2022-10-01, ∼214🔥, 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, ∼212🔥, 0💬

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