05-10-2016
Not listed in your list of "I knows": I think you could do this with shell builtins, and I don't mean the bash/ksh dependent ones.
Also, if it's supposed to work with any filename "including space, tabs, etc" then it fails at line one, where you don't put double quotes around $1.
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LEARN ABOUT PLAN9
readlink
READLINK(1) User Commands READLINK(1)
NAME
readlink - print resolved symbolic links or canonical file names
SYNOPSIS
readlink [OPTION]... FILE...
DESCRIPTION
Note realpath(1) is the preferred command to use for canonicalization functionality.
Print value of a symbolic link or canonical file name
-f, --canonicalize
canonicalize by following every symlink in every component of the given name recursively; all but the last component must exist
-e, --canonicalize-existing
canonicalize by following every symlink in every component of the given name recursively, all components must exist
-m, --canonicalize-missing
canonicalize by following every symlink in every component of the given name recursively, without requirements on components exis-
tence
-n, --no-newline
do not output the trailing delimiter
-q, --quiet,
-s, --silent
suppress most error messages (on by default)
-v, --verbose
report error messages
-z, --zero
end each output line with NUL, not newline
--help display this help and exit
--version
output version information and exit
AUTHOR
Written by Dmitry V. Levin.
REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report readlink translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2017 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.
SEE ALSO
readlink(2), realpath(1), realpath(3)
Full documentation at: <http://www.gnu.org/software/coreutils/readlink>
or available locally via: info '(coreutils) readlink invocation'
GNU coreutils 8.28 January 2018 READLINK(1)