realpath --version (return code: 0)
realpath (GNU coreutils) 8.25
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Pádraig Brady.
realpath --help (return code: 0)
Usage: realpath [OPTION]... FILE...
Print the resolved absolute file name;
all but the last component must exist
-e, --canonicalize-existing all components of the path must exist
-m, --canonicalize-missing no path components need exist or be a directory
-L, --logical resolve '..' components before symlinks
-P, --physical resolve symlinks as encountered (default)
-q, --quiet suppress most error messages
--relative-to=FILE print the resolved path relative to FILE
--relative-base=FILE print absolute paths unless paths below FILE
-s, --strip, --no-symlinks don't expand symlinks
-z, --zero end each output line with NUL, not newline
--help display this help and exit
--version output version information and exit
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Full documentation at: <http://www.gnu.org/software/coreutils/realpath>
or available locally via: info '(coreutils) realpath invocation'