Ssh (OpenSSH client)

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ssh[1] is the OpenSSH ssh client for logging or executing commands into remote devices/machines

     ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface] [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]
        [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11] [-i identity_file] [-J destination] [-L address]
        [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port] [-Q query_option] [-R address] [-S ctl_path]
        [-W host:port] [-w local_tun[:remote_tun]] destination [command]
-X Enables X11 forwarding
ssh -V


Windows: Settings > Apps and click “Manage optional features” under Apps & features.

Configuration[edit]

  • Configuration file: ~/.ssh/config


Usage[edit]

  • ssh REMOTE_USERNAME@REMOTE_SERVER_NAME_OR_IP
  • ssh -vvv REMOTE_USERNAME@REMOTE_SERVER_NAME_OR_IP (-v increase verbosity, maximum 3)
    • ssh -vvv REMOTE_USERNAME@REMOTE_SERVER_NAME_OR_IP 2>&1 | grep "STRING_TO_SEARCH"

Execute a remote command:

  • ssh USERNAME@SERVER_NAME '/path/to/remote/scripts/backup.sh'
  • ssh -Q kex SERVER

Multiplexing options[edit]

ssh -O check server.example.org or ssh -O check username@server.example.org 
Master running (pid=26289)
ssh -O check username@server.example.org 
Control socket connect(/path/): No such file or directory

To stop an specific multiplexed session:

ssh -O stop username@server.example.org

Avoid using Multiplexing for a connections:

ssh -o "ControlMaster=no" server.example.org


See also: Configure OpenSSH to reuse ssh connections

Logs[edit]

ssh -i id_ed25519_xxxxx.pub SERVER_NAME
Load key "id_ed25519_xxxxx.pub": invalid format
Solution:
Use private key instead of public key [2]
ssh -i id_ed25519_xxxxx SERVER_NAME

Activities[edit]

See also[edit]

  • http://man7.org/linux/man-pages/man1/ssh.1.html
  • https://stackoverflow.com/a/48330113