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    <p>You may be interested in <a href="http://developer.apple.com/documentation/Darwin/Reference/ManPages/man3/realpath.3.html" rel="noreferrer"><code>realpath(3)</code></a>, or Python's <a href="http://docs.python.org/library/os.path.html#os.path.realpath" rel="noreferrer"><code>os.path.realpath</code></a>. The two aren't exactly the same; the C library call requires that intermediary path components exist, while the Python version does not.</p> <pre class="lang-none prettyprint-override"><code>$ pwd /tmp/foo $ ls -l total 16 -rw-r--r-- 1 miles wheel 0 Jul 11 21:08 a lrwxr-xr-x 1 miles wheel 1 Jul 11 20:49 b -&gt; a lrwxr-xr-x 1 miles wheel 1 Jul 11 20:49 c -&gt; b $ python -c 'import os,sys;print(os.path.realpath(sys.argv[1]))' c /private/tmp/foo/a </code></pre> <p>I know you said you'd prefer something more lightweight than another scripting language, but just in case compiling a binary is insufferable, you can use Python and ctypes (available on Mac OS X 10.5) to wrap the library call:</p> <pre class="lang-py prettyprint-override"><code>#!/usr/bin/python import ctypes, sys libc = ctypes.CDLL('libc.dylib') libc.realpath.restype = ctypes.c_char_p libc.__error.restype = ctypes.POINTER(ctypes.c_int) libc.strerror.restype = ctypes.c_char_p def realpath(path): buffer = ctypes.create_string_buffer(1024) # PATH_MAX if libc.realpath(path, buffer): return buffer.value else: errno = libc.__error().contents.value raise OSError(errno, "%s: %s" % (libc.strerror(errno), buffer.value)) if __name__ == '__main__': print realpath(sys.argv[1]) </code></pre> <p>Ironically, the C version of this script ought to be shorter. :)</p>
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    1. POHow can I get the behavior of GNU's readlink -f on a Mac?
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    1. COYes, `realpath` is indeed what I want. But it seems rather awkward that I have to compile a binary to get this function from a shell script.
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    2. COWhy not use the Python one-liner in the shell script then? (Not so different from a one-line call to `readlink` itself, is it?)
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