chroot(1m) 맨 페이지 - 윈디하나의 솔라나라

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chroot

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:



     tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i)  ATTRI-
     BUTE TYPEATTRIBUTE VALUE _ Availabilitysystem/core-os

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.
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