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 columns by using the −−output option together with a columns list in environments where a stable output is required.

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 columns.

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

−p, −−task pid

Display only the namepsaces 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 and uts. This option may be given more than once.

−u, −−notruncate

Do not truncate text in columns.

−V, −−version

Display version information and exit.

−h, −−help

Display help text and exit.


Karel Zak <>


unshare(1), nsenter(1), clone(2)


The lsns command is part of the util-linux package and is available from

  Man page for the lsns command.
Copyright 2015 Karel Zak <>
May be distributed under the GNU General Public License