SSH-ADD(1) (NAME) ssh-add - (SYNOPSIS) ssh-add [-CcDdKkLlNqvXx] [-E fingerprint_hash] [-H hostkey_file] [-h destination_constraint] [-S provider] [-t life] [file ...] ssh-add -s pkcs11 [-Cv] [certificate ...] ssh-add -e pkcs11 ssh-add -T pubkey ... ssh-add -Q (DESCRIPTION) ssh-add ssh-agent(1) . ~/.ssh/id_rsa ~/.ssh/id_ecdsa ~/.ssh/id_ecdsa_sk ~/.ssh/id_ed25519 ~/.ssh/id_ed25519_sk ~/.ssh/id_mldsa44_ed25519 . ssh-add -cert.pub . . (passphrase) ssh-add . (tty) . ssh-add . SSH_AUTH_SOCK ssh-add . : (OPTIONS) -C . -c . ssh-askpass(1) . ssh-askpass(1) . -D . -d . ssh-add . . ssh-add .pub . - ssh-add . -E fingerprint_hash () (fingerprint) . : md5 sha256. sha256 . -e pkcs11 PKCS#11 pkcs11 . -H hostkey_file (known hosts) -h . . ssh-add ssh_config(5) : ~/.ssh/known_hosts ~/.ssh/known_hosts2 /etc/ssh/ssh_known_hosts /etc/ssh/ssh_known_hosts2. -h destination_constraint . [user@]dest-hostname ( ssh-agent(1) ) . src- hostname>[user@]dst-hostname ssh-agent(1) (forwarded) ( src-hostname ) dst-hostname . . ssh-agent(1) (hop) . host-b host- c host-b host-b>host-c . ssh-add . (wildcard) . ssh-add . OpenSSH 8.9 . ssh-agent(1) SSH . ssh- agent(1) ssh(1) . SSH_AUTH_SOCK ( ). -K (resident keys) FIDO . -k . -L . -l . -N ssh-add . . -Q . : . -q . -S provider FIDO USB HID . -s pkcs11 PKCS#11 pkcs11 . . PKCS#11 . -T pubkey ... pubkey . -t life . sshd_config(5) . -v (verbose). ssh-add . . -v . . -X . -x . (ENVIRONMENT) DISPLAY SSH_ASKPASS SSH_ASKPASS_REQUIRE ssh-add . ssh-add DISPLAY SSH_ASKPASS SSH_ASKPASS ( ssh-askpass) X11 . ssh-add .xsession . SSH_ASKPASS_REQUIRE askpass . never ssh- add . prefer ssh-add TTY askpass . force askpass DISPLAY . SSH_AUTH_SOCK (Unix-domain socket) . SSH_SK_PROVIDER FIDO USB HID . (FILES) ~/.ssh/id_ecdsa ~/.ssh/id_ecdsa_sk ~/.ssh/id_ed25519 ~/.ssh/id_ed25519_sk ~/.ssh/id_mldsa44_ed25519 ~/.ssh/id_rsa ECDSA ECDSA Ed25519 Ed25519 MLDSA44-ED25519 RSA . . ssh-add . (EXIT STATUS) 0 1 ssh-add 2 . (SEE ALSO) ssh(1) ssh-agent(1) ssh-askpass(1) ssh-keygen(1) sshd(8) (AUTHORS) OpenSSH ssh 1.2.12 Tatu Ylonen . Aaron Campbell Bob Beck Markus Friedl Niels Provos Theo de Raadt Dug Song OpenSSH . Markus Friedl 1.5 2.0 SSH . OpenSSH 11 2026 SSH-ADD(1)