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Test Your Knowledge in Computers #968
Difficulty: Medium
In 2011. Kernel.org began offering Linux kernel release information in JSON format.
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users(1) [posix man page]

USERS(1)                                                           User Commands                                                          USERS(1)

NAME
users - print the user names of users currently logged in to the current host SYNOPSIS
users [OPTION]... [FILE] DESCRIPTION
Output who is currently logged in according to FILE. If FILE is not specified, use /var/run/utmp. /var/log/wtmp as FILE is common. --help display this help and exit --version output version information and exit AUTHOR
Written by Joseph Arceneaux and David MacKenzie. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report users translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
getent(1), who(1) Full documentation at: <http://www.gnu.org/software/coreutils/users> or available locally via: info '(coreutils) users invocation' GNU coreutils 8.28 January 2018 USERS(1)

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WHO(1)                                                             User Commands                                                            WHO(1)

NAME
who - show who is logged on SYNOPSIS
who [OPTION]... [ FILE | ARG1 ARG2 ] DESCRIPTION
Print information about users who are currently logged in. -a, --all same as -b -d --login -p -r -t -T -u -b, --boot time of last system boot -d, --dead print dead processes -H, --heading print line of column headings --ips print ips instead of hostnames. with --lookup, canonicalizes based on stored IP, if available, rather than stored hostname -l, --login print system login processes --lookup attempt to canonicalize hostnames via DNS -m only hostname and user associated with stdin -p, --process print active processes spawned by init -q, --count all login names and number of users logged on -r, --runlevel print current runlevel -s, --short print only name, line, and time (default) -t, --time print last system clock change -T, -w, --mesg add user's message status as +, - or ? -u, --users list users logged in --message same as -T --writable same as -T --help display this help and exit --version output version information and exit If FILE is not specified, use /var/run/utmp. /var/log/wtmp as FILE is common. If ARG1 ARG2 given, -m presumed: 'am i' or 'mom likes' are usual. AUTHOR
Written by Joseph Arceneaux, David MacKenzie, and Michael Stone. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report who translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/who> or available locally via: info '(coreutils) who invocation' GNU coreutils 8.28 January 2018 WHO(1)

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