Lua os.execute with command line arguments

Question

I am running Lua on a Windows 7 machine and I am trying to launch a LabVIEW executable using Lua.

This is an example of the command line input that DOES work:

cmd prompt

The text I use:

"C:\Program Files\National Instruments\LabVIEW 2009\LabVIEW.exe" "C:\Program Files\National Instruments\LabVIEW 2009\examples\viserver\cmdline.llb\CommandLine.vi" -- 4.0

However no matter how I try to format this in Lua, it complains:

'C:\Program' is not recognized as an internal or external command, operable program or batch file.

I currently have it formatted as the following with no success:

local s = [["C:\Program Files\National Instruments\LabVIEW 2009\LabVIEW.exe" "C:\Program Files\National Instruments\LabVIEW 2009\examples\viserver\cmdline.llb\CommandLine.vi" -- 4.0]]
os.execute(s)

I need help formatting that local string s to do the same as what I typed into the command prompt.

This probably isn't the issue, but try escaping the backslashes ("C:\\Program Files \\National...") — Colonel Thirty Two
– Colonel Thirty Two, Commented Jan 21, 2014 at 16:11
The double brackets in Lua disable escape sequences. I think the issue is a result of the spaces, but the quotes around the paths should resolve that (or so I would think). — MrHappyAsthma
– MrHappyAsthma, Commented Jan 21, 2014 at 16:13

Etan Reisner · Accepted Answer · 2014-01-21 18:04:44Z

4

Some quick reading online suggests that you might need to wrap your command string in an extra set of quotes. Like this I think:

[[""C:\Program Files\National Instruments\LabVIEW 2009\LabVIEW.exe" "C:\Program Files\National Instruments\LabVIEW 2009\examples\viserver\cmdline.llb\CommandLine.vi" -- 4.0"]]

edited Jan 21, 2014 at 18:04

user142162

answered Jan 21, 2014 at 16:30

Etan Reisner

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2 Comments

MrHappyAsthma Over a year ago

I'm not sure where you found that because I searched a good while for a solution, but that definitely solves the problem!

Etan Reisner Over a year ago

Don't remember what I searched for exactly but I went through the MSDN page for the system function at one point before ending up on stackoverflow.com/questions/9964865/… (which referenced documentation on cmd that I'd seen before when looking into command line parsing in cmd.exe).

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