Category Archives: command line of linux

Protect Your Private Key

Posted on February 12, 2026 by Damon Luong

🔐 1️⃣ Protect Your Private Key (MOST IMPORTANT) Your key file: /etc/pki/tls/private/nighthawkappraisals.key Correct permissions: sudo chown root:root /etc/pki/tls/private/nighthawkappraisals.key sudo chmod 600 /etc/pki/tls/private/nighthawkappraisals.key This means: 🔎 2️⃣ Verify It ls -l /etc/pki/tls/private/nighthawkappraisals.key You should see: -rw——- 1 root root That is … Continue reading →

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Change the Time Zone ubuntu

Posted on August 18, 2020 by Damon Luong

Open the Terminal and enter the following command in order to list all the timezones of the specified zone: Syntax: $ timedatectl list-timezones | grep -i [zone] Example: We will use this command to list all the time zones of … Continue reading →

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Remove a Linux user

Posted on September 5, 2019 by Damon Luong

You can remove old users from your Linux server. This will revoke the user’s SSH access, and remove that user’s file and directory owner Remove the user Log in to your server via SSH. Switch to the root user: sudo … Continue reading →

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How do I unzip a zip file in Terminal?

Posted on August 13, 2019 by Damon Luong

Open a terminal ( Ctrl + Alt + T should work). Now create a temporary folder to extract the file: mkdir temp_for_zip_extract . Let’s now extract the zip file into that folder: unzip /path/to/file.zip -d temp_for_zip_extract sample here –> root@host: … Continue reading →

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How to add directory browsing in apache configuration?

Posted on August 11, 2019 by Damon Luong

One of the “must do’s” on setting a secure apache web server is to disable directory browsing.  Usually apache comes with this feature enabled but its always a good idea to get it disabled unless you really need it. First … Continue reading →

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