Content-type: text/html Man page of chroot

chroot

Section: System Administration Commands (1M)
Updated: 15 Dec 2003
Index Return to Main Contents
 

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 command, 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 process.

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 attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
AvailabilitySUNWcsu

 

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.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
EXAMPLES
ATTRIBUTES
SEE ALSO
NOTES

This document was created by man2html, using the manual pages.
Time: 02:37:09 GMT, October 02, 2010