Trouble executing a command

Hello all

This is my DOS command:

"C:\Program Files\7-Zip\7z" a -tzip \\server\dats\dailyDats.zip
db_20080522.dat

....which works fine. In Powershell I've coded this:

$a="C:\Program Files\7-Zip\7z.exe"
invoke-expression $a "a -tzip \\server\dats\dailyDats.zip db_20080522.dat"

I've tried it with the parameter string in single quotes, double quotes and
no quotes, and I've tried loading the whole expression into $a but I always
get

Invoke-Expression : A parameter cannot be found that matches parameter name
'a'.
At line:1 char:18
+ invoke-expression <<<< $a a -tzip \\server\dats\dailyDats.zip
db_20080522.dat

Can somebody tell me what I'm doing wrong?

Thanks in advance

Jacques

I'd tried that - it was the first thing I did - but I must have screwed up
the syntax because I tried again at your suggestion and this time it worked!
How annoying! After that I tried 4872 different permutations (perhaps I
exaggerate slightly), none of which worked. Possibly it's just that you have
a magic touch.

Many thanks again Shay.

Jacques

"Shay Levi" <no@xxxxxx> wrote in message
news:95d808932cea88ca8bcca32a65b0@xxxxxx

Try with the call operator (&)

& $a a -tzip \\server\dats\dailyDats.zip db_20080522.dat


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Shay Levi
$cript Fanatic
http://scriptolog.blogspot.com