screen: basics + usb serial console

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diff --git a/src/tools/screen.md b/src/tools/screen.md
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+# screen(1)
+
+```sh
+# Create new session.
+screen
+
+# List active session.
+screen -list
+
+# Attach to specific session.
+screen -r SESSION
+```
+
+## Options
+```sh
+# Enable logfile, default name screenlog.0.
+screen -L
+# Enable log and set logfile name.
+screen -L -Logfile out.txt
+```
+
+## Keymaps
+```sh
+Ctrl-A d            # Detach from session.
+Ctrl-A + \          # Terminate session.
+Ctrl-A + :          # Open cmand prompt.
+    kill            # Kill session.
+```
+
+## Examples
+USB serial console.
+```sh
+# 1500000 -> baudrate
+# cs8     -> 8 data bits
+# -cstopb -> 1 stop bit
+# -parenb -> no parity bit
+# see stty(1) for all settings.
+screen /dev/ttyUSB0 1500000,cs8,-cstopb,-parenb
+
+# Print current tty settings.
+sudo stty -F /dev/ttyUSB0 -a
+```