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Man Pages
CHROOT(8) FreeBSD System Manager's Manual CHROOT(8)

chroot
change root directory

chroot [
-u user
] [
-g group
] [
-G group,group,...
] newroot [
command
]

The chroot utility changes its current and root directories to the supplied directory newroot and then exec's command, if supplied, or an interactive copy of the user's login shell.
If the -u, -g or -G options are given, the user, group and group list of the process are set to these values after the chroot has taken place.

The following environment variable is referenced by chroot:
If set, the string specified by SHELL is interpreted as the name of the shell to exec. If the variable SHELL is not set, /bin/sh is used.

chdir(2), chroot(2), setgid(2), setgroups(2), setuid(2), getgrnam(3), environ(7), jail(8)

The chroot utility first appeared in 4.4BSD.
June 7, 2003 FreeBSD 12.0-RELEASE

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