Linux in a Nutshell, Fifth Edition

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Chapter 3: Linux Commands

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

-s reader

Add key in smartcard reader.

-t life

Set maximum lifetime when adding identities to an agent. The

value of life can be in seconds or another time format speci-

fied in sshd.

-x Lock the agent with a password.

-X Unlock the agent.

ssh-agent

ssh-agent [options] [command [arguments]]

Hold private keys used for public key authentication. ssh-agent is

usually executed at the beginning of an X or login session; then all

other windows or programs given as command are run as clients of

ssh-agent. When a command is specified, the command and any

arguments are executed. The agent dies when the command

completes. Use ssh-add to add keys (identities) to the agent. Oper-

ations that require a private key are performed by the agent, which

returns the results to the requestor. When using ssh-agent, you

must specify a shell—for example:

$ ssh-agent /bin/bash

You can then use ssh-add to add identities.

Options

-a bind_addr

Bind the agent to the socket bind_addr (default is /tmp/ssh-

nnnnnnnn/agent, where nnnnnnnn is a generated number).

-c Write csh commands to standard output. This is the default if

the environment variable SHELL looks like a csh-type shell.

-d Debug mode.

-k Kill the current agent.

-s Write Bourne shell commands to standard output. This is the

default if the ...