[RndTbl] (Simple?) Perl question

[Kevin McGregor]

Ugh. Even under Windows, doesn't

$cmd =  "./psexec.exe //" . $server_name

work the same? Is there any need to use backslashes here?

On Mon, Dec 12, 2016 at 1:53 PM, Gilbert E. Detillieux <
gedetil at cs.umanitoba.ca> wrote:

> Yup, makes sense now...
>
> After this line...
>
> $cmd =  "./psexec.exe \\\\\\\\" . $server_name
>
> ... the cmd variable will contain "./psexec.exe \\\\server" (4
> backslashes.  On running this line...
>
> my $output = `$cmd`
>
> ... the shell will see "./psexec.exe \\\\server", and the command will see
> (after shell quote processing) argv[1] set to "\\server".
>
> Each level of "\" escape processing requires that you double the number of
> "\" characters entered to get one through.  If you want to end up with 2,
> after 2 levels, you need 8.
>
> Gilbert
>
> On 12/12/2016 1:43 PM, Kevin McGregor wrote:
>
>> I should add that this gets run immediately after via
>>
>> my $output = `$cmd`
>>
>> if that makes any difference.
>>
>> On Mon, Dec 12, 2016 at 1:40 PM, Kevin McGregor
>> <kevin.a.mcgregor at gmail.com <mailto:kevin.a.mcgregor at gmail.com>> wrote:
>>
>>     I'm trying to decipher some Perl code which runs on a Windows
>>     server, and I ran into this:
>>
>>     $cmd =  "./psexec.exe \\\\\\\\" . $server_name
>>
>>     I think the idea is to end up with
>>
>>     ./psexec.exe \\server
>>
>>     but WTF eight backslashes? Does that make any sense? If so, can
>>     someone ELI5?
>>
>>     Kevin
>>
>
> --
> Gilbert E. Detillieux           E-mail: <gedetil at cs.umanitoba.ca>
> Dept. of Computer Science       Web:    http://www.cs.umanitoba.ca/~ge
> detil/
> University of Manitoba          Phone:  (204)474-8161
> Winnipeg MB CANADA  R3T 2N2     Fax:    (204)474-7609
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