usage: grep.py [--help] [-e PATTERN] [-f PATTERN_FILE] [-F] [-i]
               [--no-ignore-case] [-v] [-w] [-x] [-c] [-L] [-l] [-o] [-q] [-H]
               [-h] [-n] [-A NUM] [-B NUM] [-C NUM]
               ...

positional arguments:
  FILES                 Files to search.

options:
  --help                show this help message and exit

Matching Control:
  -e PATTERN, --regexp PATTERN
                        Use PATTERN as the pattern.
  -f PATTERN_FILE, --file PATTERN_FILE
                        Obtain patterns from PATTERN_FILE, one per line.
  -F, --fixed-strings   Interpret patterns as fixed strings.
  -i, --ignore-case     Ignore case distinctions in patterns and input data.
  --no-ignore-case      Do not ignore case distinctions in patterns and input
                        data. This is the default.
  -v, --invert-match    Invert the sense of matching, to select non-matching
                        lines.
  -w, --word-regexp     Select only those lines containing matches that form
                        whole words.
  -x, --line-regexp     Select only those matches that exactly match the whole
                        line.

Output Control:
  -c, --count           Suppress normal output; instead print a count of
                        matching lines for each input file.
  -L, --files-without-match
                        Suppress normal output; instead print the name of each
                        input file from which no output would normally have
                        been printed.
  -l, --files-with-match
                        Suppress normal output; instead print the name of each
                        input file from which output would normally have been
                        printed.
  -o, --only-matching   Print only the matched (non-empty) parts of a matching
                        line, with each such part on a separate output line.
  -q, --quiet           Quiet; do not write anything to standard output. Exit
                        immediately with zero status if any match is found.

Output Line Prefix Control:
  -H, --with-filename   Print the file name for each match. This is the
                        default when there is more than one file to search.
  -h, --no-filename     Suppress the prefixing of file names on output. This
                        is the default when there is only one file (or only
                        standard input) to search.
  -n, --line-number     Prefix each line of output with the 1-based line
                        number within its input file.

Context Line Control:
  -A NUM, --after-context NUM
                        Print NUM lines of trailing context after matching
                        lines.
  -B NUM, --before-context NUM
                        Print NUM lines of leading context before matching
                        lines.
  -C NUM, --context NUM
                        Print NUM lines of output context.