BusyBox v1.29.3 (2018-11-02 15:37:50 PDT) multi-call binary.
    Usage: grep [-HhnlLoqvsriwFEz] [-m N] [-A/B/C N] PATTERN/-e PATTERN.../-f FILE [FILE]...
    Search for PATTERN in FILEs (or stdin)
    	-H	Add 'filename:' prefix
    	-h	Do not add 'filename:' prefix
    	-n	Add 'line_no:' prefix
    	-l	Show only names of files that match
    	-L	Show only names of files that don't match
    	-c	Show only count of matching lines
    	-o	Show only the matching part of line
    	-q	Quiet. Return 0 if PATTERN is found, 1 otherwise
    	-v	Select non-matching lines
    	-s	Suppress open and read errors
    	-r	Recurse
    	-i	Ignore case
    	-w	Match whole words only
    	-x	Match whole lines only
    	-F	PATTERN is a literal (not regexp)
    	-E	PATTERN is an extended regexp
    	-z	Input is NUL terminated
    	-m N	Match up to N times per file
    	-A N	Print N lines of trailing context
    	-B N	Print N lines of leading context
    	-C N	Same as '-A N -B N'
    	-e PTRN	Pattern to match
    	-f FILE	Read pattern from file

Designed by SanjuD(@ngineerbabu)