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SSH-ADD (1) | General commands | Unix Manual Pages | :man▋
NAME
ssh-add - adds RSA or DSA identities to the authentication agent
CONTENTS
Synopsis
Description
Environment
Files
Diagnostics
See Also
Authors
SYNOPSIS
ssh-add [-cDdLlXx] [-t life] [] ssh-add -s reader ssh-add -e reader
DESCRIPTION
ssh-add adds RSA or DSA identities to the authentication agent, ssh-agent(1). When run without arguments, it adds the files ~/.ssh/id_rsa, ~/.ssh/id_dsa and ~/.ssh/identity. Alternative file names can be given on the command line. If any file requires a passphrase, ssh-add asks for the passphrase from the user. The passphrase is read from the user’s tty. ssh-add retries the last passphrase if multiple identity files are given. The authentication agent must be running and the SSH_AUTH_SOCK environment variable must contain the name of its socket for ssh-add to work. The options are as follows: | -c | Indicates that added identities should be subject to confirmation before being used for authentication. Confirmation is performed by the SSH_ASKPASS program mentioned below. Successful confirmation is signaled by a zero exit status from the SSH_ASKPASS program, rather than text entered into the requester. | | -D | Deletes all identities from the agent. | | -d | Instead of adding the identity, removes the identity from the agent. | | -e reader | | | Remove key in smartcard reader. | | -L | Lists public key parameters of all identities currently represented by the agent. | | -l | Lists fingerprints of all identities currently represented by the agent. | | -s reader | | | Add key in smartcard reader. | | -t life | | | Set a maximum lifetime when adding identities to an agent. The lifetime may be specified in seconds or in a time format specified in sshd_config(5). | | -X | Unlock the agent. | | -x | Lock the agent with a password. | |
ENVIRONMENT
| "DISPLAY" and "SSH_ASKPASS" | | | If ssh-add needs a passphrase, it will read the passphrase from the current terminal if it was run from a terminal. If ssh-add does not have a terminal associated with it but DISPLAY and SSH_ASKPASS are set, it will execute the program specified by SSH_ASKPASS and open an X11 window to read the passphrase. This is particularly useful when calling ssh-add from a .xsession or related script. (Note that on some machines it may be necessary to redirect the input from /dev/null to make this work.) | | SSH_AUTH_SOCK | | | Identifies the path of a unix-domain socket used to communicate with the agent. | |
FILES
| ~/.ssh/identity | | | Contains the protocol version 1 RSA authentication identity of the user. | | ~/.ssh/id_dsa | | | Contains the protocol version 2 DSA authentication identity of the user. | | ~/.ssh/id_rsa | | | Contains the protocol version 2 RSA authentication identity of the user. | |
Identity files should not be readable by anyone but the user. Note that ssh-add ignores identity files if they are accessible by others.
DIAGNOSTICS
Exit status is 0 on success, 1 if the specified command fails, and 2 if ssh-add is unable to contact the authentication agent.
SEE ALSO
ssh(1), ssh-agent(1), ssh-keygen(1), sshd(8)
AUTHORS
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