unshare(flags) == -1) err(EXIT_FAILURE, "unshare"); execvp(argv[optind], &argv[optind]); err(EXIT_FAILURE ... execvp"); } SEE ALSO unshare (1), clone (2), fork (2), kcmp (2), setns…Join that namespace */ err(EXIT_FAILURE, "setns"); execvp(argv[2], &argv[2]); /* Execute a command ... namespace */ err(EXIT_FAILURE, "execvp"); } SEE ALSO nsenter (1), clone (2), …