lsns
lists information about Linux namespaces
TLDR
List all namespaces
SYNOPSIS
lsns [options] [namespace]
DESCRIPTION
lsns lists information about Linux namespaces. Namespaces provide isolation for various system resources, and this tool displays which namespaces exist and which processes are using them.
PARAMETERS
-t, --type TYPE
Filter by namespace type (mnt, net, ipc, user, pid, uts, cgroup, time)-p, --task PID
Show namespaces for specific process-o, --output LIST
Specify columns to display-l, --list
Use list output format-J, --json
Output in JSON format-r, --raw
Use raw output format-n, --noheadings
Do not print headers-u, --notruncate
Do not truncate text in columns-W, --nowrap
Do not wrap multi-line cells-P, --persistent
Show only persistent namespaces-T, --tree REL
Show tree view with specified relationship
NAMESPACE TYPES
mnt: Mount points
net: Network resources
ipc: System V IPC objects
user: User and group IDs
pid: Process IDs
uts: Hostname and domain
cgroup: Cgroup root directory
time: Boot and monotonic clocks
CAVEATS
Non-root users may see incomplete results as some namespace information requires elevated privileges. The default output format may change between versions; use explicit options for scripts.
HISTORY
lsns is part of util-linux, providing visibility into the Linux namespace subsystem used for containerization and process isolation.
SEE ALSO
nsenter(1), unshare(1), namespaces(7), ip-netns(8)