IdentityFile

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     IdentityFile
             Specifies a file from which the user's DSA, ECDSA,
             authenticator-hosted ECDSA, Ed25519, authenticator-hosted
             Ed25519 or RSA authentication identity is read.  The
             default is ~/.ssh/id_dsa, ~/.ssh/id_ecdsa,
             ~/.ssh/id_ecdsa_sk, ~/.ssh/id_ed25519, ~/.ssh/id_ed25519_sk
             and ~/.ssh/id_rsa.  Additionally, any identities
             represented by the authentication agent will be used for
             authentication unless IdentitiesOnly is set.  If no
             certificates have been explicitly specified by
             CertificateFile, ssh(1) will try to load certificate
             information from the filename obtained by appending
             -cert.pub to the path of a specified IdentityFile.

             Arguments to IdentityFile may use the tilde syntax to refer
             to a user's home directory or the tokens described in the
             TOKENS section.

             It is possible to have multiple identity files specified in
             configuration files; all these identities will be tried in
             sequence.  Multiple IdentityFile directives will add to the
             list of identities tried (this behaviour differs from that
             of other configuration directives).

             IdentityFile may be used in conjunction with IdentitiesOnly
             to select which identities in an agent are offered during
             authentication.  IdentityFile may also be used in
             conjunction with CertificateFile in order to provide any
             certificate also needed for authentication with the
             identity.


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