$ curl cheat.sh/
# rar
# The RAR archiver. Supports multi-volume archives that can be optionally self-extracting.
# More information: <https://manned.org/rar>.

# Archive 1 or more files:
rar a path/to/archive_name.rar path/to/file1 path/to/file2 path/to/file3

# Archive a directory:
rar a path/to/archive_name.rar path/to/directory

# Split the archive into parts of equal size (50M):
rar a -v50M -R path/to/archive_name.rar path/to/file_or_directory

# Password protect the resulting archive:
rar a -ppassword path/to/archive_name.rar path/to/file_or_directory

# Encrypt file data and headers with password:
rar a -hppassword path/to/archive_name.rar path/to/file_or_directory

# Use a specific compression level (0-5):
rar a -mcompression_level path/to/archive_name.rar path/to/file_or_directory

$
Follow @igor_chubin cheat.sh tldr