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+//po4a: entry man manual
+= pivot_root(8)
+:doctype: manpage
+:man manual: System Administration
+:man source: util-linux {release-version}
+:page-layout: base
+:command: pivot_root
+
+== NAME
+
+pivot_root - change the root filesystem
+
+== SYNOPSIS
+
+*pivot_root* _new_root_ _put_old_
+
+== DESCRIPTION
+
+*pivot_root* moves the root file system of the current process to the directory _put_old_ and makes _new_root_ the new root file system. Since *pivot_root*(8) simply calls *pivot_root*(2), we refer to the man page of the latter for further details.
+
+Note that, depending on the implementation of *pivot_root*, root and current working directory of the caller may or may not change. The following is a sequence for invoking *pivot_root* that works in either case, assuming that *pivot_root* and *chroot* are in the current *PATH*:
+
+....
+cd new_root
+pivot_root . put_old
+exec chroot . command
+....
+
+Note that *chroot* must be available under the old root and under the new root, because *pivot_root* may or may not have implicitly changed the root directory of the shell.
+
+Note that *exec chroot* changes the running executable, which is necessary if the old root directory should be unmounted afterwards. Also note that standard input, output, and error may still point to a device on the old root file system, keeping it busy. They can easily be changed when invoking *chroot* (see below; note the absence of leading slashes to make it work whether *pivot_root* has changed the shell's root or not).
+
+== OPTIONS
+
+include::man-common/help-version.adoc[]
+
+== EXAMPLE
+
+Change the root file system to _/dev/hda1_ from an interactive shell:
+
+....
+mount /dev/hda1 /new-root
+cd /new-root
+pivot_root . old-root
+exec chroot . sh <dev/console >dev/console 2>&1
+umount /old-root
+....
+
+Mount the new root file system over NFS from 10.0.0.1:/my_root and run *init*:
+
+....
+ifconfig lo 127.0.0.1 up   # for portmap
+# configure Ethernet or such
+portmap   # for lockd (implicitly started by mount)
+mount -o ro 10.0.0.1:/my_root /mnt
+killall portmap   # portmap keeps old root busy
+cd /mnt
+pivot_root . old_root
+exec chroot . sh -c 'umount /old_root; exec /sbin/init' \
+  <dev/console >dev/console 2>&1
+....
+
+== SEE ALSO
+
+*chroot*(1),
+*pivot_root*(2),
+*mount*(8),
+*switch_root*(8),
+*umount*(8)
+
+include::man-common/bugreports.adoc[]
+
+include::man-common/footer.adoc[]
+
+ifdef::translation[]
+include::man-common/translation.adoc[]
+endif::[]