user-setup

Script to create a shared Ubuntu user with sudo access, Miniconda, switch-cuda, SSH key pair, and optional data/code paths.

Requirements

• Ubuntu system
• Run as root (sudo)
• git and curl must be installed
• nvcc already installed on the system

Usage

sudo ./setup_user.sh

The script will prompt for:

Prompt	Required	Notes
Username	Yes
Password	Yes	Confirmed twice
Sudo access	No	y/N
SSH key name	Yes	e.g. lab_key — generates a key pair
Install Miniconda	No	y/N
Conda envs directory	If Miniconda=y	Full path, shared across users, not chowned
CUDA version	No	Defaults to 11.8
Extra data/code paths	No	Comma-separated full paths, created if missing

Safe to re-run — skips steps already completed (existing user, existing key, existing Miniconda install, duplicate .bashrc entries).

At the end, the script prints a developer checklist with exact commands to connect and finish setup (create conda env, verify CUDA, etc.).

---

What the script sets up

1. User — created with useradd, password set, optionally added to sudo group
2. SSH key pair — ed25519 pair generated in ~/.ssh/<keyname>, public key added to authorized_keys
3. Extra paths — created with mkdir -p, owned by the new user
4. Miniconda — installed to ~/miniconda3, conda init bash run, .condarc written to point envs_dirs at your shared path
5. switch-cuda — repo cloned to ~/switch-cuda, source ~/switch-cuda/switch-cuda.sh <version> appended to ~/.bashrc

---

Reverting each step

1. Delete the user and home directory

sudo pkill -u <username>        # kill any running processes first
sudo userdel -r <username>      # removes /home/<username> and everything in it

This removes: home dir, .ssh/ keys, ~/miniconda3, ~/switch-cuda, .bashrc, .condarc.

2. Remove conda envs (if created by the user)

The conda envs directory is shared and not owned by the user, so it is not removed by userdel. Clean up manually:

sudo rm -rf /your/conda/envs/path/<env_name>   # specific env
# or
sudo rm -rf /your/conda/envs/path              # entire envs dir

3. Remove extra data/code paths

These are also not removed by userdel. Delete manually:

sudo rm -rf /your/extra/path

4. Undo individual steps (without deleting the user)

Remove sudo access:

sudo deluser <username> sudo

Revoke SSH access (remove key from authorized_keys):

sudo truncate -s 0 /home/<username>/.ssh/authorized_keys
# or delete specific key by editing the file

Remove Miniconda:

sudo rm -rf /home/<username>/miniconda3
sudo rm -f  /home/<username>/.condarc
# also remove the conda init block from ~/.bashrc (lines between
# "# >>> conda initialize >>>" and "# <<< conda initialize <<<")

Remove switch-cuda:

sudo rm -rf /home/<username>/switch-cuda
# remove the source line from ~/.bashrc:
sudo sed -i '/switch-cuda\.sh/d' /home/<username>/.bashrc