lsns from util-linux 2.29

Usage: lsns [options] [<namespace>] List system namespaces. Options: -J, --json use JSON output format -l, --list use list format output -n, --noheadings don't print headings -o, --output <list> define which output columns to use -p, --task <pid> print process namespaces -r, --raw use the raw output format -u, --notruncate donot truncate text in columns -t, --type <name> namespace type (mnt, net, ipc, user, pid, uts, cgroup) -h, --help display this help, and exit -V, --version output version information, and exit Available columns (for --output): NS namespace identifier (inode number) TYPE kind of namespace PATH path to the namespace NPROCS number of processes in the namespace PID lowest PID in the namespace PPID PPID of the PID COMMAND command line of the PID UID UID of the PID USER username of the PID For more details, see lsns(8).