Is there a ssh key management tool, for the Linux command line, that makes a key available to various windows after one entry of the key's passphrase? I'm thinking of something similar to Putty's pageant, which requires the passphrase to load the key but then supplies the key to Putty whenever needed for a connection.
In Linux I use command lines in terminal windows, and even with agents each window seems to require a passphrase entry. If I want more than one window into a remote host I have to repeat the passphrase for each window.
I suppose I've overlooked some obvious functionality of ssh or the agents, but so far I can't find a way to do this.