Termux

Terminal + Linux env for Android. No root.

Install

• F-Droid (not Play Store)

First steps

pkg update && pkg upgrade
termux-setup-storage          # ~/storage → /storage/emulated/0

SSH

• Port 8022, key-only

sshd -d -p 8022               # debug
sshd -p 8022                  # daemon

• Dies on app kill - no auto-restart

Storage

• Shared storage is noexec → bash script.sh, not ./script.sh
• No ~/storage? Run termux-setup-storage
• Use ~/storage/shared/..., not /storage/emulated/0/...

Networking

• ip addr blocked (SELinux)
• ZT iface invisible - read IP from ZT app

Utilities

• ssha — ssh + agent. mosh --ssh="ssha" laptop
• mosh-bin — mosh-client binary

SSH key backup

tar czf - -C ~ .ssh | openssl enc -aes-256-cbc -pbkdf2 | ssh laptop 'cat > backup.tar.gz.enc'
openssl enc -d -aes-256-cbc -pbkdf2 -in backup.tar.gz.enc | tar xzf - -C ~
chmod -R 600 ~/.ssh && chmod 700 ~/.ssh

Related

• termux-ssh-mosh-zerotier · ssh · Zerotier · tmux · mosh
• pi.dev Termux docs