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Toybox 0.8.4-android multicall binary:  (see toybox --help) 
usage:  grep [-EFrivwcloqsHbhn] [-ABC NUM] [-m MAX] [-e REGEX]... [-MS PATTERN]... [-f REGFILE] [FILE]...


Show lines matching regular expressions. If no -e, first argument is
regular expression to match. With no files (or "-" filename) read stdin.
Returns 0 if matched, 1 if no match found, 2 for command errors.
-e  Regex to match. (May be repeated.)
-f  File listing regular expressions to match.

file search:
-r  Recurse into subdirectories (defaults FILE to ".")
-R  Recurse into subdirectories and symlinks to directories
-M  Match filename pattern (--include) 
-S  Skip filename pattern (--exclude) 
--exclude-dir=PATTERN  Skip directory pattern
-I  Ignore binary files

match type:
-A  Show NUM lines after     -B  Show NUM lines before match
-C  NUM lines context (A+B)  -E  extended regex syntax
-F  fixed (literal match)    -a  always text (not binary)
-i  case insensitive         -m  match MAX many lines
-v  invert match             -w  whole word (implies -E)
-x  whole line               -z  input NUL terminated

display modes: (default: matched line)
-c  count of matching lines  -l  show only matching filenames
-o  only matching part       -q  quiet (errors only)
-s  silent (no error msg)    -Z  output NUL terminated

output prefix (default: filename if checking more than 1 file)
-H  force filename           -b  byte offset of match
-h  hide filename            -n  line number of match

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