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    FYI, the reason it checks for $? -ge 2 is because exit code 1 is when the ssh-agent has no keys, but ssh-agent is already running. Commented Aug 9, 2019 at 23:00
  • Note that some desktop environments (e.g. Ubuntu Mate) may automatically run ssh-agent for you but you have to run ssh-add without parameters to add private keys into your keyring. For example, when you first connect to remote machine that contains private keys, you have to run ssh-add on the remote matchine to get the keys into your client machine keyring. Commented Mar 21, 2020 at 9:51
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    I am curious, when it's possible to set this up in a few lines of a shell script, what is the purpose of keychain, ssh-ident or other projects. Commented Apr 12, 2020 at 10:29
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    FYI, if you have a .bashrc file, you have to put theses lines instead of .profile (see head ~/.profile for explanations) Commented Nov 10, 2020 at 10:01
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    @Asenar No. .profile is the right file for what runs at login time. .bashrc runs every time you open a terminal. See superuser.com/questions/183870/… Commented Nov 10, 2020 at 10:50