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Linus Torvalds released the Linux kernel as free software under the GNU General Public License in 1991.
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runcon(1) [linux man page]

RUNCON(1)							   User Commands							 RUNCON(1)

NAME
runcon - run command with specified security context SYNOPSIS
runcon CONTEXT COMMAND [args] runcon [ -c ] [-u USER] [-r ROLE] [-t TYPE] [-l RANGE] COMMAND [args] DESCRIPTION
Run COMMAND with completely-specified CONTEXT, or with current or transitioned security context modified by one or more of LEVEL, ROLE, TYPE, and USER. If none of -c, -t, -u, -r, or -l, is specified, the first argument is used as the complete context. Any additional arguments after COMMAND are interpreted as arguments to the command. Note that only carefully-chosen contexts are likely to successfully run. Run a program in a different security context. With neither CONTEXT nor COMMAND, print the current security context. CONTEXT Complete security context -c, --compute compute process transition context before modifying -t, --type=TYPE type (for same role as parent) -u, --user=USER user identity -r, --role=ROLE role -l, --range=RANGE levelrange --help display this help and exit --version output version information and exit AUTHOR
Written by Russell Coker. REPORTING BUGS
Report runcon bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report runcon translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2010 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
The full documentation for runcon is maintained as a Texinfo manual. If the info and runcon programs are properly installed at your site, the command info coreutils 'runcon invocation' should give you access to the complete manual. GNU coreutils 8.5 February 2011 RUNCON(1)

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