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Linux 2.6 - man page for ischroot (linux section 1)

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ISCHROOT(1)									      ISCHROOT(1)

NAME
       ischroot - detect if running in a chroot

SYNOPSIS
       ischroot [--default-false] [--default-true] [--help] [--version]

DESCRIPTION
       ischroot detects if it is currently running in a chroot. The exit status is:

       0      if currently running in a chroot

       1      if currently not running in a chroot

       2      if  the  detection  is not possible (On GNU/Linux this happens if the script is not
	      run as root).

OPTIONS
       -f, --default-false
	      Exit with status 1 if the detection is not possible.

       -t, --default-true
	      Exit with status 0 if the detection is not possible.

       --help Print a usage message on standard output and exit successfully.

       --version
	      Print version information on standard output and exit successfully.

BUGS
       On GNU/Linux, chroot detection is not possible when not	root.  This  works  correctly  on
       GNU/Hurd and GNU/kFreeBSD.

Debian					   30 May 2011				      ISCHROOT(1)
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