ssh-agent does not remember passphrase code example
Example 1: ssh agent remember passphrase
$ ssh-add .ssh/id_rsa
Enter passphrase for .ssh/id_rsa:
Identity added: .ssh/id_rsa (.ssh/id_rsa)
Example 2: ssh agent remember passphrase
$ SSH_AUTH_SOCK=/tmp/ssh-hZQhwQlxahPX/agent.1833; export SSH_AUTH_SOCK;
$ SSH_AGENT_PID=1834; export SSH_AGENT_PID;