ssh-ping

Check if host is reachable using ssh_config

Outputs Reply from when server is reachable but login failed
Outputs Pong from when server is reachable and login was successful

$ ssh-ping -c 3 kim

SSHPING kim
Reply from kim: ssh_seq=1 time=109 ms
Reply from kim: ssh_seq=2 time=136 ms
Reply from kim: ssh_seq=3 time=141 ms

--- kim ping statistics ---
3 requests transmitted, 3 requests received, 0% request loss

ssh-version

Shows version of the SSH server you are connecting to

$ ssh-version kim

Remote protocol version 2.0, remote software version OpenSSH_7.2p2 Ubuntu-4ubuntu2.6

ssh-diff

Diff a file over SSH

$ ssh-diff /etc/hosts kim

Comparing kim:/etc/hosts (<) with /etc/hosts (>)

1,2c1,2
< 127.0.0.1 localhost
< 127.0.1.1 kim
---
> 127.0.0.1 localhost
> 127.0.1.1 blinky

ssh-facts

Get some facts about the remote system

$ ssh-facts kim

OS=ubuntu
OS_VERSION=16.04
UPTIME=7 days, 22 hours, 25 minutes
LAST_REBOOT=Dec 20 19:34:27 2018
CPU_CORES=2
CPU_SOCKETS=2
HOSTNAME=kim
KERNEL_NAME=Linux
MACHINE=x86_64
MACHINE_TYPE=virtual_by_kvm
MEMORY=4045996
INIT=systemd
LSB_CODENAME=xenial
LSB_DESCRIPTION=Ubuntu 16.04.5 LTS
LSB_ID=Ubuntu
LSB_RELEASE=16.04

ssh-hostkeys

Prints server host keys in several formats

 $ ssh-hostkeys kim

  (ECDSA)   256     MD5 3d:8e:49:6e:40:34:c6:e4:c8:5f:60:d9:ad:bf:1f:b9
  (ECDSA)   256  SHA256 txYpmPENBWolKBaA5EkCM/y1Hm2DP81jtABFrWUBf/c
(ED25519)   256     MD5 a8:93:71:f9:13:d0:32:02:c0:e5:1e:f6:b9:db:8c:b0
(ED25519)   256  SHA256 JZMLzNS2ifdGYv2SrqDodz7+/qaRCTBPukaCnMQqbX8
    (RSA)  2048     MD5 8b:37:63:cd:58:fd:9c:18:93:08:3a:4c:84:64:87:91
    (RSA)  2048  SHA256 WkOzD8BaeljejgTTAwECkByyb4kHdI0pnJB2/gcS1Lk

ssh-keyinfo

Prints keys in several formats

 $ ssh-keyinfo ~/.ssh/*.pub

(RSA)  2048     MD5 40:52:aa:14:a5:9a:fe:b5:96:c0:d2:dc:99:f1:a5:77    /home/vaporup/.ssh/id_rsa.pub
(RSA)  2048  SHA256 V4F6ipY4gG83sQGM0eRk0+g1RWE9K4asDUj1jFpCa48        /home/vaporup/.ssh/id_rsa.pub

ssh-certinfo

Shows validity and information of SSH certificates

$ ssh-certinfo ~/.ssh/*.pub

/home/vaporup/.ssh/id_rsa-cert.pub    SSH_CERT_VALID      forever             ->  forever
/home/vaporup/.ssh/test1-cert.pub     SSH_CERT_INVALID    2038-01-19T04:14:07 ->  2038-01-19T04:14:07
/home/vaporup/.ssh/test2-cert.pub     SSH_CERT_EXPIRED    1988-11-14T13:36:40 ->  1991-08-11T14:36:40


$ ssh-certinfo -v ~/.ssh/*.pub

/home/vaporup/.ssh/id_rsa-cert.pub:
        Type: ssh-rsa-cert-v01@openssh.com user certificate
        Public key: RSA-CERT SHA256:Mm7o312345YEaWetVshTBslX48h0XJceLWzxx3RugDg
        Signing CA: RSA SHA256:4fcOpOm/Xk12345mYnihk0cr6SdjghPgONxriMJex+A
        Key ID: "vaporup"
        Serial: 0
        Valid: forever
        Principals: (none)
        Critical Options: (none)
        Extensions:
                permit-X11-forwarding
                permit-agent-forwarding
                permit-port-forwarding
                permit-pty
                permit-user-rc

ssh-force-password

Enforces password authentication (as long as the server allows it).
It became quite annoying googling the SSH options for this every time.
e.g. used to skip key-based login for password testing.

$ ssh-force-password kim

vaporup@kim's password:

jeisc / ssh-tools