AFAIK, you cannot
directly pass args from the command line to Wireshark Lua, but an easy alternative would be to use environment variables. Set an environment variable and query it from your script, using
os.getenv.
Here's an example from OSX:
$ echo "print('TESTVAR', os.getenv('TESTVAR'))" > test.lua
$ TESTVAR="hello world" tshark -v -Xlua_script:test.lua
TESTVAR hello world
TShark 1.7.0 (SVN Rev 38064 from /trunk)
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (64-bit) with GLib 2.28.8, with libpcap 1.1.1, with libz 1.2.5, without
POSIX capabilities, without threads support, without libpcre, without SMI,
without c-ares, without ADNS, with Lua 5.1, without Python, without GnuTLS,
without Gcrypt, with MIT Kerberos, without GeoIP.
Running on Mac OS 10.7.0 (Darwin 11.0.0), with locale en_US.UTF-8, with libpcap
version 1.1.1, with libz 1.2.5.
Built using llvm-gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build
2335.15.00).
$
