– adds RSA or DSA identities to the authentication agent
[-cDdLlXx [-t life
adds RSA or DSA identities to the authentication agent,
When run without arguments, it adds the files
After loading a private key,
will try to load corresponding certificate information from the
filename obtained by appending
to the name of the private key file.
Alternative file names can be given on the command line.
If any file requires a passphrase,
asks for the passphrase from the user.
The passphrase is read from the user’s tty.
retries the last passphrase if multiple identity files are given.
The authentication agent must be running and the
environment variable must contain the name of its socket for
The options are as follows:
program mentioned below.
Successful confirmation is signaled by a zero exit status from the
program, rather than text entered into the requester.
has been run without arguments, the keys for the default identities will
Otherwise, the argument list will be interpreted as a list of paths to
public key files and matching keys will be removed from the agent.
If no public key is found at a given path,
needs a passphrase, it will read the passphrase from the current
terminal if it was run from a terminal.
does not have a terminal associated with it but
are set, it will execute the program specified by
and open an X11 window to read the passphrase.
This is particularly useful when calling
or related script.
(Note that on some machines it
may be necessary to redirect the input from
to make this work.)
environment variable is set to value other than
the OpenSSL random generator is reseeded from
The number of bytes read is defined by the SSH_USE_STRONG_RNG value.
Minimum is 14 bytes.
This setting is not recommended on the computers without the hardware
random generator because insufficient entropy causes the connection to
be blocked until enough entropy is available.
Identity files should not be readable by anyone but the user.
Exit status is 0 on success, 1 if the specified command fails,
and 2 if
OpenSSH is a derivative of the original and free
ssh 1.2.12 release by Tatu Ylonen.
Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
Theo de Raadt and Dug Song
removed many bugs, re-added newer features and
Markus Friedl contributed the support for SSH
protocol versions 1.5 and 2.0.