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chrony is an implementation of the Network Time Protocol (NTP) and is a replacement for the ntpd.
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chroot(1) [centos man page]

CHROOT(1)							   User Commands							 CHROOT(1)

NAME
chroot - run command or interactive shell with special root directory SYNOPSIS
chroot [OPTION] NEWROOT [COMMAND [ARG]...] chroot OPTION DESCRIPTION
Run COMMAND with root directory set to NEWROOT. --userspec=USER:GROUP specify user and group (ID or name) to use --groups=G_LIST specify supplementary groups as g1,g2,..,gN --help display this help and exit --version output version information and exit If no command is given, run '${SHELL} -i' (default: '/bin/sh -i'). GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report chroot translation bugs to <http://translationproject.org/team/> AUTHOR
Written by Roland McGrath. COPYRIGHT
Copyright (C) 2013 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
chroot(2) The full documentation for chroot is maintained as a Texinfo manual. If the info and chroot programs are properly installed at your site, the command info coreutils 'chroot invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 CHROOT(1)

Check Out this Related Man Page

CHROOT(1)							   User Commands							 CHROOT(1)

NAME
chroot - run command or interactive shell with special root directory SYNOPSIS
chroot NEWROOT [COMMAND [ARG]...] chroot OPTION DESCRIPTION
Run COMMAND with root directory set to NEWROOT. --help display this help and exit --version output version information and exit If no command is given, run ``${SHELL} -i'' (default: /bin/sh). AUTHOR
Written by Roland McGrath. REPORTING BUGS
Report chroot 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/> COPYRIGHT
Copyright (C) 2009 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
chroot(2) The full documentation for chroot is maintained as a Texinfo manual. If the info and chroot programs are properly installed at your site, the command info coreutils 'chroot invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 CHROOT(1)

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