unsandbox.com

A fast command-line client for executing code and running interactive sessions in unsandbox. Auto-detects languages, supports 42+ programming languages, and 30+ shells/REPLs.

# Download binary (Linux x86_64)
wget https://unsandbox.com/downloads/un
chmod +x un

# Set API key
export UNSANDBOX_API_KEY=usk_your_key_here

# Run any code file
./un script.py

# Start interactive session
./un session

Downloads

Documentation clarifications

Build from Source

# Requirements: GCC, libcurl-dev, and libwebsockets-dev
sudo apt-get install build-essential libcurl4-openssl-dev libwebsockets-dev  # Debian/Ubuntu
sudo dnf install gcc libcurl-devel libwebsockets-devel  # Fedora/RHEL

# Download and compile
wget https://unsandbox.com/downloads/un.c
gcc -Wall -O2 -o un un.c -lcurl -lwebsockets

# Install system-wide (optional)
sudo cp un /usr/local/bin/

Demo

Execute Code

Run a Script

./un hello.py
./un app.js
./un main.rs

With Environment Variables

./un -e DEBUG=1 -e NAME=World script.py

With Input Files (teleport files into sandbox)

./un -f data.csv -f config.json process.py

Get Compiled Binary (teleport artifacts out)

./un -a -o ./bin main.c

Interactive Sessions

Start a Shell Session

# Default bash shell
./un session

# Choose your shell
./un session --shell zsh
./un session --shell fish

# Jump into a REPL
./un session --shell python3
./un session --shell node
./un session --shell julia

Session with Network Access

./un session -n semitrusted

Session Auditing (full terminal recording)

# Record everything (including vim, interactive programs)
./un session --audit -o ./logs

# Replay session later
zcat session.log*.gz | less -R

Collect Artifacts from Session

# Files in /tmp/artifacts/ are collected on exit
./un session -a -o ./outputs

Session Persistence (tmux/screen)

# Default: session terminates on disconnect (clean exit)
./un session

# With tmux: session persists, can reconnect later
./un session --tmux
# Press Ctrl+b then d to detach

# With screen: alternative multiplexer
./un session --screen
# Press Ctrl+a then d to detach

List Active Sessions

./un session --list

# Output:
# Active sessions: 2
#
# SESSION ID                               CONTAINER            SHELL      TTL      STATUS
# abc123...                                unsb-vm-12345        python3    45m30s   active
# def456...                                unsb-vm-67890        bash       1h2m     active

Reconnect to Existing Session

# Reconnect by container name (requires --tmux or --screen)
./un session --attach unsb-vm-12345

# Use exit to terminate session, or detach to keep it running

Terminate a Session

./un session --kill unsb-vm-12345

Available Shells & REPLs

Shells: bash, dash, sh, zsh, fish, ksh, tcsh, csh, elvish, xonsh, ash

REPLs:  python3, bpython, ipython    # Python
        node                          # JavaScript
        ruby, irb                     # Ruby
        lua                           # Lua
        php                           # PHP
        perl                          # Perl
        guile, scheme                 # Scheme
        ghci                          # Haskell
        erl, iex                      # Erlang/Elixir
        sbcl, clisp                   # Common Lisp
        r                             # R
        julia                         # Julia
        clojure                       # Clojure

Usage Reference

Usage: ./un [options] <source_file>
       ./un session [options]

Commands:
  (default)        Execute source file in sandbox
  session          Open interactive shell/REPL session

Options:
  -e KEY=VALUE     Set environment variable (can use multiple times)
  -f FILE          Add input file (can use multiple times)
  -a               Return and save artifacts from /tmp/artifacts/
  -o DIR           Output directory for artifacts (default: current dir)
  -k KEY           API key (or set UNSANDBOX_API_KEY env var)
  -n MODE          Network mode: zerotrust (default) or semitrusted
  -h               Show this help

Session options:
  -s, --shell SHELL  Shell/REPL to use (default: bash)
  -l, --list         List active sessions
  --attach ID        Reconnect to existing session (ID or container name)
  --kill ID          Terminate a session (ID or container name)
  --audit            Record full session for auditing
  --tmux             Enable session persistence with tmux (allows reconnect)
  --screen           Enable session persistence with screen (allows reconnect)

Examples:
  ./un script.py                       # execute Python script
  ./un -e DEBUG=1 script.py            # with environment variable
  ./un -f data.csv process.py          # with input file
  ./un -a -o ./bin main.c              # save compiled artifacts
  ./un session                         # interactive bash session
  ./un session --list                  # list active sessions
  ./un session --attach unsb-vm-12345  # reconnect to session
  ./un session --kill unsb-vm-12345    # terminate a session
  ./un session --shell python3         # Python REPL
  ./un session --shell node            # Node.js REPL
  ./un session -n semitrusted          # session with network access
  ./un session --audit -o ./logs       # record session for auditing