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System Administration Commands chroot(1M)
NAME
chroot - change root directory for a command
SYNOPSIS
/usr/sbin/chroot newroot command
DESCRIPTION
The chroot utility causes command to be executed relative to
newroot. The meaning of any initial slashes (/) in the path
names is changed to newroot for command and any of its child
processes. Upon execution, the initial working directory is
newroot.
Notice that redirecting the output of command to a file,
chroot newroot command >x
will create the file x relative to the original root of com-
mand, not the new one.
The new root path name is always relative to the current
root. Even if a chroot is currently in effect, the newroot
argument is relative to the current root of the running pro-
cess.
This command can be run only by the super-user.
RETURN VALUES
The exit status of chroot is the return value of command.
EXAMPLES
Example 1: Using the chroot Utility
The chroot utility provides an easy way to extract tar files
(see tar(1)) written with absolute filenames to a different
location. It is necessary to copy the shared libraries used
by tar (see ldd(1)) to the newroot filesystem.
example# mkdir /tmp/lib; cd /lib
example# cp ld.so.1 libc.so.1 libcmd.so.1 libdl.so.1 libsec.so.1 /tmp/lib
example# cp /usr/bin/tar /tmp
example# dd if=/dev/rmt/0 | chroot /tmp tar xvf -
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
SunOS 5.10 Last change: 15 Dec 2003 1
System Administration Commands chroot(1M)
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
cd(1), tar(1), chroot(2), ttyname(3C), attributes(5)
NOTES
Exercise extreme caution when referencing device files in
the new root file system.
References by routines such as ttyname(3C) to stdin, stdout,
and stderr will find that the device associated with the
file descriptor is unknown after chroot is run.
SunOS 5.10 Last change: 15 Dec 2003 2
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Wed Sep 12 11:25:50 GMT 2007
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