Provided by: util-linux_2.38.1-4ubuntu1_amd64 bug


       lsns - list namespaces


       lsns [options] namespace


       lsns lists information about all the currently accessible namespaces or about the given
       namespace. The namespace identifier is an inode number.

       The default output is subject to change. So whenever possible, you should avoid using
       default outputs in your scripts. Always explicitly define expected output mode (--tree or
       --list) and columns by using the --output option together with a columns list in
       environments where a stable output is required.

       The NSFS column, printed when net is specified for the --type option, is special; it uses
       multi-line cells. Use the option --nowrap to switch to ","-separated single-line

       Note that lsns reads information directly from the /proc filesystem and for non-root users
       it may return incomplete information. The current /proc filesystem may be unshared and
       affected by a PID namespace (see unshare --mount-proc for more details). lsns is not able
       to see persistent namespaces without processes where the namespace instance is held by a
       bind mount to /proc/pid/ns/type.


       -J, --json
           Use JSON output format.

       -l, --list
           Use list output format.

       -n, --noheadings
           Do not print a header line.

       -o, --output list
           Specify which output columns to print. Use --help to get a list of all supported

           The default list of columns may be extended if list is specified in the format +list
           (e.g., lsns -o +PATH).

           Output all available columns.

       -p, --task PID
           Display only the namespaces held by the process with this PID.

       -r, --raw
           Use the raw output format.

       -t, --type type
           Display the specified type of namespaces only. The supported types are mnt, net, ipc,
           user, pid, uts, cgroup and time. This option may be given more than once.

       -u, --notruncate
           Do not truncate text in columns.

       -W, --nowrap
           Do not use multi-line text in columns.

       -T, --tree rel
           Use tree-like output format. If process is given as rel, print process tree(s) in each
           name space. This is default when --tree is not specified. If parent is given, print
           tree(s) constructed by the parent/child relationship. If owner is given, print tree(s)
           constructed by the owner/owned relationship. owner is used as default when rel is

       -h, --help
           Display help text and exit.

       -V, --version
           Print version and exit.


       Karel Zak <>


       nsenter(1), unshare(1), clone(2), namespaces(7), ioctl_ns(2), ip-netns(8)


       For bug reports, use the issue tracker at


       The lsns command is part of the util-linux package which can be downloaded from Linux
       Kernel Archive <>.