1chroot(1M)              System Administration Commands              chroot(1M)
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NAME

6       chroot - change root directory for a command
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SYNOPSIS

9       /usr/sbin/chroot newroot command
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DESCRIPTION

13       The  chroot  utility causes command to be executed relative to newroot.
14       The meaning of any initial slashes (/) in the path names is changed  to
15       newroot for command and any of its child processes. Upon execution, the
16       initial working directory is newroot.
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19       Notice that redirecting the output of command to a file,
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21         chroot newroot command >x
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26       will create the file x relative to the original root  of  command,  not
27       the new one.
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30       The  new root path name is always relative to the current root. Even if
31       a chroot is currently in effect, the newroot argument  is  relative  to
32       the current root of the running process.
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35       This command can be run only by the super-user.
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RETURN VALUES

38       The exit status of chroot is the return value of command.
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EXAMPLES

41       Example 1 Using the chroot Utility
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44       The  chroot  utility  provides  an  easy  way to extract tar files (see
45       tar(1)) written with absolute filenames to a different location. It  is
46       necessary  to copy the shared libraries used by tar (see ldd(1)) to the
47       newroot filesystem.
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50         example# mkdir /tmp/lib; cd /lib
51         example# cp ld.so.1 libc.so.1 libcmd.so.1 libdl.so.1 \
52                  libsec.so.1 /tmp/lib
53         example# cp /usr/bin/tar /tmp
54         example# dd if=/dev/rmt/0 | chroot /tmp tar xvf -
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ATTRIBUTES

59       See attributes(5) for descriptions of the following attributes:
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64       ┌─────────────────────────────┬─────────────────────────────┐
65       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
66       ├─────────────────────────────┼─────────────────────────────┤
67       │Availability                 │SUNWcsu                      │
68       └─────────────────────────────┴─────────────────────────────┘
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SEE ALSO

71       cd(1), tar(1), chroot(2), ttyname(3C), attributes(5)
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NOTES

74       Exercise extreme caution when referencing device files in the new  root
75       file system.
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78       References by routines such as ttyname(3C) to stdin, stdout, and stderr
79       will find that the  device  associated  with  the  file  descriptor  is
80       unknown after chroot is run.
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84SunOS 5.11                        15 Dec 2003                       chroot(1M)