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Linux in a Nutshell

This directory of Linux commands is from Linux in a Nutshell, 5th Edition.

Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.

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ssh-keyscan

ssh-keyscan [options]

Gather public and private host keys from a number of hosts. Can be used in scripts.

Options

-4

Use IPv4 addresses only.

-6

Use IPv6 addresses only.

-f file

Read hostnames or addrlist namelist pairs from file. If - is specified instead of a filename, read hosts or addrlist namelist pairs from standard input.

-p port

Specify the port to connect to on the remote host.

-t type

Specify the type of key to get from the scanned hosts. Possible values are rsa1 for SSH1 (default), or rsa or dsa for SSH2. Specify multiple values in a comma-separated list.

-T timeout

Specify the timeout for attempting a connection, in seconds.

-v

Verbose mode.