ischroot (1) - Linux Manuals

ischroot: detect if running in a chroot

Command to display ischroot manual in Linux: $ man 1 ischroot

ischroot - detect if running in a chroot

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

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).

-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.

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