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--- helpful_ubuntu_commands [2025/05/30 13:30] – mike
+++ helpful_ubuntu_commands [2025/12/06 10:01] (current) – mike
@@ Line 10: / 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 22: / 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 41: / 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
+=== Finding files by file name (or file name portion) ===
+  find . -iname <filename to search for>
 === 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 94: / Line 105: @@
 Then proceed to format the new drive, i.e. **mkfs -t ext4 /dev/sdb1**
-=== Changing the server's IP address ===
+==== 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 ===
+==== Changing the server's host name ====
   hostnamectl set-hostname [new host name]