This project is based on Rust official tutorial: An I/O Project. There are tiny differences that I modified for improve usage(e.g., using command-line option instead of an environment variable).
Usage: minigrep [OPTIONS] <SEARCH_TERM> <FILE_PATH>
Arguments:
<SEARCH_TERM>
<FILE_PATH>
Options:
-m, --match-case searching case-sensitivity
-h, --help Print help
-V, --version Print version