Maybe we should split the thread?
Yes, That would be a good idea, but I have no clue how it works in this forum.
What is difference between these two (opposite direction and = instead of >) ?
-XMP-dc:Subject > IPTC:Keywords -XMP-dc:Title > IPTC:ObjectName
-IPTC:Keywords=xmp-dc:Subject -IPTC:ObjectName=xmp-dc:Title
Ah, so sorry! Copied the wrong line from the terminal; I’d been trying a few things and went too far back in the history. This does work for me in Bash:
exiftool '-IPTC:Keywords<xmp-dc:Subject' '-IPTC:ObjectName<xmp-dc:Title' image.jpg
Note the lack of spaces between the tag names and that I had to quote each argument separately. Hopefully that will work for you.
[edit: actually the spaces don’t matter, but enclosing each argument in quotes does.]
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The equal sign (=) assigns the value following it to the tag; > or < copies the tag in the direction of the arrow. Using your example:
The first line will copy the contents of XMP-dc:Subject to IPTC:Keywords and copy XMP-dc:Title to IPTC:ObjectName
The second line will set IPTC:Keywords to the literal value “xmp-dc:Subject” and IPTC:ObjectName to the literal value “xmp-dc:Title” which isn’t really what I wasn’t trying to do. 
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@ashurbanipal
Yes, your are right. Following works in cmd.exe
exiftool "-IPTC:Keywords<xmp-dc:Subject" "-IPTC:ObjectName<xmp-dc:Title" image.jpg
with input image.jpg
XMP
Subject: IPTC tags test, exiftool
Title: title 1
results in
IPTC
Object Name: title 1
Keywords: IPTC tags test, exiftool
Thanks!
Perfect. It really works in Exiftool.
Problem is it is not working in LUA script, because the script will not handle double " "
I tried:
A) cmd_options[1] = “-IPTC:Keywords<xmp-dc:Subject” “-IPTC:ObjectName<xmp-dc:Title”
B) I tried also directly into:
exif_cmd = “exiftool “…””"…tostring("-IPTC:Keywords<xmp-dc:Subject" “-IPTC:Keywords<xmp-dc:Subject”)…"""…" -overwrite_original “…”"" … imgexp … “”"
But script will not run at all with any of these options.
@P_Cherry You have to escape the quotes with \ . Otherwise they get interpreted by LUA itself and not passed to the cmd.exe as they are. Please correct me if I am wrong here.
cmd_options[1] = "-XMP-dc:Subject>IPTC:Keywords\" \"-IPTC:ObjectName<xmp-dc:Title"
The outer quotes are required to save it as string. The whole command is build at the end and there I added quotes as well. So for cmd_options[1] the second quote is skipped.
exif_cmd = "exiftool ".."\""..tostring(cmd_options.value).."\"".." -overwrite_original ".."\"" .. imgexp .. "\""
For your case the script could be much more simplified as you do not need all this options?
@pk5dark: Perfect, it is really working with escapes now. Thanks a lot.
Yes, I will simplify the script for my purpose. Is it possible to specify the whole path to exiftool, not to have to copy it into Windows folder?
e.g. exif_cmd = "c:/Programs/exiftool "…