$ curl cheat.sh/
# realpath
# Display the resolved absolute path for a file or directory.
# More information: <https://www.gnu.org/software/coreutils/realpath>.

# Display the absolute path for a file or directory:
realpath path/to/file_or_directory

# Require all path components to exist:
realpath --canonicalize-existing path/to/file_or_directory

# Resolve ".." components before symlinks:
realpath --logical path/to/file_or_directory

# Disable symlink expansion:
realpath --no-symlinks path/to/file_or_directory

# Suppress error messages:
realpath --quiet path/to/file_or_directory

$
Follow @igor_chubin cheat.sh tldr