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The Lounge War Stories Data Centre meets Vacuum Cleaner Post 303014244 by Don Cragun on Thursday 8th of March 2018 04:25:31 AM
Old 03-08-2018
Many years ago, while I was working at Sun Microsystems, Inc. on adding POSIX-conformance into SunOS 4.1, I was making changes to the OS and utilities during the day and running complete builds of the system overnight (starting a build just before I left work in the evening). This worked fine for several weeks until one Monday night when the system died at about 8:30pm killing the build-in-progress. There was no core dump, no indication of any hardware problems, and restarting the build when I got to work Tuesday morning completed normally (taking a little over three hours to complete).

The same thing happened the next three days in a row, with the system always dying sometime between 8:20pm and 8:40pm.

I decided to stay at work late Friday evening to see if I could figure out what was causing the crashes. I went to the bathroom at about 7pm so I would be sure that I could be at my computer by 7:15pm and would be able to stay there until I found out why my computer was dying every night. When I got back to my office five minutes later, I found that my computer had been unplugged by a member of the cleaning crew so he could plug in the vacuum cleaner they used to clean the hallway and offices where my office was located. (The way my office was arranged left a power strip close to the hallway while other offices in my area had their power strips in less accessible locations.) I unplugged the sweeper, plugged my computer back in, and waited for the cleaning guy to come back to my office.

I found out that:
  1. the cleaning crew comes in an hour and a half earlier on Friday that they did Monday through Thursday,
  2. they got a new vacuum cleaner on Monday with a cord that wouldn't reach from the plugs in the conference room to the other end of the building, and
  3. unplugging a computer is inconsequential to a janitor if doing so allows him to sweep the carpets at the end of the hallway.
 

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FINGER(1)						    BSD General Commands Manual 						 FINGER(1)

NAME
finger -- user information lookup program SYNOPSIS
finger [-8ghlmops] [user ...] [user@host ...] DESCRIPTION
The finger displays information about the system users. Options are: -8 Pass through 8-bit data. This option is intended for enabling 8-bit data output in the fingerd(8) service. Using this from the com- mand line is dangerous, as the output data may include control characters for your terminal. -g This option restricts the gecos output to only the users' real names. -h When used in conjunction with the -s option, the name of the remote host is displayed instead of the office location and office phone. -l Produces a multi-line format displaying all of the information described for the -s option as well as the user's home directory, home phone number, login shell, mail status, and the contents of the files ``.forward'', ``.plan'' and ``.project'' from the user's home directory. If idle time is at least a minute and less than a day, it is presented in the form ``hh:mm''. Idle times greater than a day are pre- sented as ``d day[s]hh:mm''. Phone numbers specified as eleven digits are printed as ``+N-NNN-NNN-NNNN''. Numbers specified as ten or seven digits are printed as the appropriate subset of that string. Numbers specified as five digits are printed as ``xN-NNNN''. Numbers specified as four digits are printed as ``xNNNN''. If write permission is denied to the device, the phrase ``(messages off)'' is appended to the line containing the device name. One entry per user is displayed with the -l option; if a user is logged on multiple times, terminal information is repeated once per login. Mail status is shown as ``No Mail.'' if there is no mail at all, ``Mail last read DDD MMM ## HH:MM YYYY (TZ)'' if the person has looked at their mailbox since new mail arriving, or ``New mail received ...'', ``Unread since ...'' if they have new mail. -m Prevent matching of user names. User is usually a login name; however, matching will also be done on the users' real names, unless the -m option is supplied. All name matching performed by finger is case insensitive. -o When used in conjunction with the -s option, the office location and office phone information is displayed instead of the name of the remote host. -p Prevents the -l option of finger from displaying the contents of the ``.forward'', ``.plan'' and ``.project'' files. -s finger displays the user's login name, real name, terminal name and write status (as a ``*'' after the terminal name if write permis- sion is denied), idle time, login time, and either office location and office phone number, or the remote host. If -h is given, the remote is printed. If -o is given, the office location and phone number is printed instead (the default). Idle time is in minutes if it is a single integer, hours and minutes if a ``:'' is present, or days if a ``d'' is present. Login time is displayed as the dayname if less than six days, else month, day, hours and minutes, unless more than six months ago, in which case the year is displayed rather than the hours and minutes. Unknown devices as well as nonexistent idle and login times are displayed as single asterisks. If no options are specified, finger defaults to the -l style output if operands are provided, otherwise to the -s style. Note that some fields may be missing, in either format, if information is not available for them. If no arguments are specified, finger will print an entry for each user currently logged into the system. finger may be used to look up users on a remote machine. The format is to specify a user as ``user@host'', or ``@host'', where the default output format for the former is the -l style, and the default output format for the latter is the -s style. The -l option is the only option that may be passed to a remote machine. FILES
/var/log/lastlog last login data base SEE ALSO
chpass(1), w(1), who(1) HISTORY
The finger command appeared in 3.0BSD. BSD
September 12, 2002 BSD
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