helpful_ubuntu_commands
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| helpful_ubuntu_commands [2025/05/30 13:32] – mike | helpful_ubuntu_commands [2026/04/08 08:26] (current) – mike | ||
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| ====== Helpful Ubuntu/ | ====== Helpful Ubuntu/ | ||
| - | ---- | + | |
| === Disable Ubuntu Pro " | === Disable Ubuntu Pro " | ||
| <color red> | <color red> | ||
| Line 10: | Line 10: | ||
| === List processes and the ports they are listening on === | === List processes and the ports they are listening on === | ||
| netstat -tulpn | grep LISTEN | netstat -tulpn | grep LISTEN | ||
| + | or | ||
| + | ss -tulpn | grep LISTEN | ||
| | | ||
| === Reload systemd manager configuration after changes made === | === Reload systemd manager configuration after changes made === | ||
| Line 22: | Line 24: | ||
| === Changing default editor for visudo === | === Changing default editor for visudo === | ||
| sudo update-alternatives --config editor | 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 === | === 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) | 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 < | ||
| + | | ||
| === Disable colors in the vi editor by default === | === 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. | Create (or edit, if it exists) ~/.vimrc; into this file add the command syntax off, and save the file. | ||
| Line 65: | Line 76: | ||
| === Generate password hashes (useful for Ansible playbooks amongst other things) === | === Generate password hashes (useful for Ansible playbooks amongst other things) === | ||
| mkpasswd --method=sha-512 | mkpasswd --method=sha-512 | ||
| + | | ||
| + | ==== Extracting encrypted/ | ||
| + | .zip files that have been encrypted with AES-256 cannot be extracted via the default ' | ||
| + | apt update | ||
| + | apt install 7zip | ||
| + | Once installed, use the **7zz** command to extract the file (you will be prompted for the password used to initially encrypt the archive if one was used): | ||
| + | 7zz x < | ||
| + | |||
| ==== Cookbook for passing client IP address to systems behind a reverse proxy ==== | ==== Cookbook for passing client IP address to systems behind a reverse proxy ==== | ||
| === On the reverse proxy: === | === On the reverse proxy: === | ||
| Line 94: | Line 113: | ||
| Then proceed to format the new drive, i.e. **mkfs -t ext4 /dev/sdb1** | Then proceed to format the new drive, i.e. **mkfs -t ext4 /dev/sdb1** | ||
| - | ==== Changing the server' | + | ==== Updating Network Settings ==== |
| + | |||
| + | === Changing the server' | ||
| sudo vi / | sudo vi / | ||
| find the existing IP and change it to the desired IP; ' | find the existing IP and change it to the desired IP; ' | ||
| sudo netplan apply | sudo netplan apply | ||
| | | ||
| - | ==== Changing the server' | + | === Changing the server' |
| hostnamectl set-hostname [new host name] | hostnamectl set-hostname [new host name] | ||
| | | ||
| + | === Changing the server' | ||
| + | Edit the **/ | ||
| + | Apply the changes with the **sudo netplan apply** command | ||
helpful_ubuntu_commands.1748637121.txt.gz · Last modified: by mike