 file.
Alternative file names can be given on the command line.
<P>

If any file requires a passphrase,
<B>ssh-add</B>


asks for the passphrase from the user.
The passphrase is read from the user's tty.
<B>ssh-add</B>


retries the last passphrase if multiple identity files are given.
<P>

The authentication agent must be running and the
<B>SSH_AUTH_SOCK</B>

environment variable must contain the name of its socket for
<B>ssh-add</B>


to work.
<P>

The options are as follows:
<DL COMPACT>
<P>

<DT><B>-c</