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SSH-AGENT(1)              BSD General Commands ManualSSH-AGENT(1)NAME     ssh-agent -- OpenSSH authentication agentSYNOPSIS     ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash]               [-P provider_whitelist] [-t life] [command [arg ...]]     ssh-agent [-c | -s] -kDESCRIPTION     ssh-agent is a program to hold private keys used for public key authenti-     cation.  Through use of environment variables the agent can be located     and automatically used for authentication when logging in to other ma-     chines usingssh(1).     The options are as follows:     -a bind_address             Bind the agent to the UNIX-domain socket bind_address.  The de-             fault is $TMPDIR/ssh-XXXXXXXXXX/agent.<ppid>.     -c      Generate C-shell commands on stdout.  This is the default if             SHELL looks like it's a csh style of shell.     -D      Foreground mode.  When this option is specified ssh-agent will             not fork.     -d      Debug mode.  When this option is specified ssh-agent will not             fork and will write debug information to standard error.     -E fingerprint_hash             Specifies the hash algorithm used when displaying key finger-             prints.  Valid options are: "md5" and "sha256".  The default is             "sha256".     -k      Kill the current agent (given by the SSH_AGENT_PID environment             variable).     -P provider_whitelist             Specify a pattern-list of acceptable paths for PKCS#11 and FIDO             authenticator shared libraries that may be used with the -S or -s             options tossh-add(1).  Libraries that do not match the whitelist             will be refused.  See PATTERNS inssh_config(5) for a description             of pattern-list syntax.  The default whitelist is             "/usr/lib/*,/usr/local/lib/*".     -s      Generate Bourne shell commands on stdout.  This is the default if             SHELL does not look like it's a csh style of shell.     -t life             Set a default value for the maximum lifetime of identities added             to the agent.  The lifetime may be specified in seconds or in a             time format specified insshd_config(5).  A lifetime specified             for an identity withssh-add(1) overrides this value.  Without             this option the default maximum lifetime is forever.     command [arg ...]             If a command (and optional arguments) is given, this is executed             as a subprocess of the agent.  The agent exits automatically when             the command given on the command line terminates.     There are two main ways to get an agent set up.  The first is at the     start of an X session, where all other windows or programs are started as     children of the ssh-agent program.  The agent starts a command under     which its environment variables are exported, for example ssh-agent xterm     &.  When the command terminates, so does the agent.     The second method is used for a login session.  When ssh-agent is     started, it prints the shell commands required to set its environment     variables, which in turn can be evaluated in the calling shell, for exam-     ple eval `ssh-agent -s`.     In both cases,ssh(1) looks at these environment variables and uses them     to establish a connection to the agent.     The agent initially does not have any private keys.  Keys are added usingssh-add(1) or byssh(1) when AddKeysToAgent is set inssh_config(5).     Multiple identities may be stored in ssh-agent concurrently andssh(1)     will automatically use them if present.ssh-add(1) is also used to re-     move keys from ssh-agent and to query the keys that are held in one.     Connections to ssh-agent may be forwarded from further remote hosts using     the -A option tossh(1) (but see the caveats documented therein), avoid-     ing the need for authentication data to be stored on other machines.  Au-     thentication passphrases and private keys never go over the network: the     connection to the agent is forwarded over SSH remote connections and the     result is returned to the requester, allowing the user access to their     identities anywhere in the network in a secure fashion.ENVIRONMENT     SSH_AGENT_PID  When ssh-agent starts, it stores the name of the agent's                    process ID (PID) in this variable.     SSH_AUTH_SOCK  When ssh-agent starts, it creates a UNIX-domain socket and                    stores its pathname in this variable.  It is accessible                    only to the current user, but is easily abused by root or                    another instance of the same user.     In Debian, ssh-agent is installed with the set-group-id bit set, to pre-     ventptrace(2) attacks retrieving private key material.  This has the     side-effect of causing the run-time linker to remove certain environment     variables which might have security implications for set-id programs, in-     cluding LD_PRELOAD, LD_LIBRARY_PATH, and TMPDIR.  If you need to set any     of these environment variables, you will need to do so in the program ex-     ecuted by ssh-agent.FILES     $TMPDIR/ssh-XXXXXXXXXX/agent.<ppid>             UNIX-domain sockets used to contain the connection to the authen-             tication agent.  These sockets should only be readable by the             owner.  The sockets should get automatically removed when the             agent exits.SEE ALSOssh(1),ssh-add(1),ssh-keygen(1),ssh_config(5),sshd(8)AUTHORS     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 cre-     ated OpenSSH.  Markus Friedl contributed the support for SSH protocol     versions 1.5 and 2.0.BSD                            December 21, 2019                           BSD