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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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chfn(1) 						      General Commands Manual							   chfn(1)

NAME
chfn - change finger information SYNOPSIS
chfn [-D binddn] [-P path] [-f name] [-o office] [-p phone] [-h home_phone] [-m other] [-r service] [-q] [-u] [-v] [user] DESCRIPTION
chfn is used to change the user finger information. This are the users fullname, office room number, office phone number and home phone number. This information is stored in the /etc/passwd file and typically printed by finger(1) and similiar programs. A normal user may only change the fields for their own account, the super user may change the fields for any account. Also, only the super user may use the -o option to change the undefined portions of the GECOS field. If no information is given on the command line, chfn operates in an interactive fashion, prompting the user for each field. Enter the new value to change the field, or leave the line blank to use the current value. Enter none or a blank only to remove the current value. The current value is displayed between a pair of [ ] marks. The only restrictions placed on the contents of the fields is that no control characters may be present, nor any of comma, colon, or equal sign. The other field does not have this restriction, and is used to store accounting information used by other applications. This version of chfn is able to change the shell of local, NIS, NIS+ and LDAP accounts, if the permissions allow it. OPTIONS
-D, --binddn binddn Use the Distinguished Name binddn to bind to the LDAP directory. The user will be prompted for a password for simple authentica- tion. -P, --path path The passwd and shadow files are located below the specified directory path. chfn will use this files, not /etc/passwd and /etc/shadow. This is useful for example on NIS master servers, where you do not want to give all users in the NIS database auto- matic access to your NIS server and the NIS map is build from special files. -f, --full-name Specify your real name. -o, --office Specify your office room number. -p, --phone Specify your office phone number. -h, --home-phone Specify your home phone number. -m, --other Specify the undefined portions of the GECOS field. -r, --service Specify the service where the GECOS field should be changed. Supported services are files, ldap, nis and nisplus. -q, --quite Don't be verbose. -u, --usage Print a usage message and exit. --help Print a more verbose help text and exit. -v, --version Print version information and exit. ENVIRONMENT
SHADOW_CHFN - If this environment variable is set to 1, the chfn options are compatible to the version from the shadow suite. FILES
/etc/passwd - user account information SEE ALSO
chsh(1), finger(1), passwd(5) AUTHOR
Thorsten Kukuk <kukuk@suse.de> pwdutils February 2004 chfn(1)
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