Under X, asks user for a passphrase for ssh-add
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This is Jim Knoble's implementation of the ssh-askpass program, originally called x11-ssh-askpass upstream. It is built on low-level X11 libraries, and therefore has minimal dependencies.

Other ssh-askpass programs are available, some of which may integrate better into various desktop environments.
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Peyrol 1 year ago

This is handy if you want to launch an app from the menu which requires sudo. For example, on Linux Mint I added "file browser sudo" with the command line env SUDO_ASKPASS=/usr/bin/ssh-askpass sudo -A caja --no-desktop --browser %U