flock: unrecognized option: w
BusyBox v1.36.1 (2025-06-23 20:40:36 UTC) multi-call binary.

Usage: flock [-sxun] FD | { FILE [-c] PROG ARGS }

[Un]lock file descriptor, or lock FILE, run PROG

	-s	Shared lock
	-x	Exclusive lock (default)
	-u	Unlock FD
	-n	Fail rather than wait