A genuine Linux kernel booting entirely in your browser via WebAssembly β not a simulation. Every command really runs. Nothing persists between sessions, and there's no real network access, so it's completely safe to experiment in.
This downloads a small Linux kernel and root filesystem (~38MB, one time per start) and runs it with a CPU emulator entirely on your device β no server involved. First boot takes 10-20 seconds. There's no persistent storage or real network access inside the VM, so anything you do resets when you leave or restart it.
vim β vi,
useradd/userdel β adduser/deluser,
groupadd/groupdel β addgroup/delgroup. Everything
else β passwd, su, git, curl, awk, and more β
works under its usual name. Run busybox --list inside the VM to see everything available.