Serial and Telnet

sshc serial --json
sshc serial /dev/ttyUSB0 --baud 115200 --encoding utf-8

Serial options include data bits, parity, stop bits, DTR, RTS, and break duration. Flow control supports none, rtscts, and xonxoff. DTR, manual RTS, and break operations are separate from flow control.

sshc telnet 192.0.2.20:23 --encoding shift_jis

Telnet is plaintext and does not authenticate the server. Limit it to a trusted isolated network or another protected boundary.

Serial and Telnet support utf-8, shift_jis, euc-jp, and iso-2022-jp. SSH encoding is saved per connection.

Non-interactive automation

sshc serial /dev/ttyUSB0 --non-interactive \
  --expect 'login:' --timeout 20s -- 'admin'

sshc telnet 192.0.2.20:23 --non-interactive \
  --script ./steps.json --json

--script cannot be combined with -- <text>, --expect, or --read-for: each step in the script file carries its own text and completion condition.

Non-interactive runs need exactly one completion condition: --expect succeeds when the regular expression matches, --read-for after reading for the given duration. Combine either with the overall --timeout, settle time, maximum bytes, line endings, and required output. JSON mode returns the result and any warnings in one object. Exit codes: 124 when the overall timeout elapses, 2 for invalid arguments, 1 for any other failure such as a transport error, and 130 when interrupted.