A simple clone of the grep
command-line tool implemented from The Rust Programming Language book.
USAGE:
minigrep <pattern> <filename> [OPTIONS]
ARGUMENTS:
<pattern> Keywords to search for
<filename> File path to read from
OPTIONS:
--any Ignore case sensitivity
MORE:
Setting an environment variable called "CASE_INSENSITIVE" will trigger
ignoring case-sensitivity in the search results. The --any flag overrides
this check.