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Title says it all. In the listings of who -u, some of the records show the string "old" in the idle time column. I know that "." means the session is not idle. What's the meaning of "old"? The manpage and Google didn't help me.

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up vote 4 down vote accepted

Try info coreutils 'who invocation':

     After the login time, print the number of hours and minutes that
     the user has been idle.  `.' means the user was active in the last
     minute.  `old' means the user has been idle for more than 24 hours.

info documentation of GNU tools is usually far more complete than man pages.

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