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--- helpful_ubuntu_commands [2025/02/22 10:03] – mike
+++ helpful_ubuntu_commands [2025/08/20 09:50] (current) – mike
@@ Line 1: / Line 1: @@
 ====== Helpful Ubuntu/Linux Commands and Procedures ======
 ----
+=== Disable Ubuntu Pro "Ads", Etc. ===
+<color red>First implemented in my network 03/20/2025; monitoring for effectiveness</color>
+  sudo pro config set apt_news=false
 === List hard drive serial numbers ===
   lsblk --nodeps -o name,serial
@@ Line 6: / Line 10: @@
 === List processes and the ports they are listening on ===
   netstat -tulpn | grep LISTEN
+or
+  ss -tulpn | grep LISTEN
 === Reload systemd manager configuration after changes made ===
@@ Line 18: / Line 24: @@
 === Changing default editor for visudo ===
   sudo update-alternatives --config editor
+If visudo complains about a missing defaults.vim file, it can be fixed thusly:
+  sudo touch ~root/.exrc
 === Disable GUI screen lock ===
@@ Line 37: / Line 46: @@
   du -a /dir/ | sort -n -r | head -n 20 (replace 20 with the # of lines you wish to have returned)
+=== Find the oldest file in a directory (and it's subdirectories) ===
+  find . -type f -printf '%T+ %p\n' | sort | head -n 1
 === Disable colors in the vi editor by default ===
   Create (or edit, if it exists) ~/.vimrc; into this file add the command syntax off, and save the file.
@@ Line 90: / Line 102: @@
 Then proceed to format the new drive, i.e. **mkfs -t ext4 /dev/sdb1**
+==== Changing the server's IP address ====
+  sudo vi /etc/netplan/00-installer-config.yaml
+  find the existing IP and change it to the desired IP; 'wq' out of the file
+  sudo netplan apply
+==== Changing the server's host name ====
+  hostnamectl set-hostname [new host name]