Escaping quotes and double quotes


How do I properly escape the quotes in the -param value in the following command line?

$cmd="\\server\toto.exe -batch=B -param="sort1;parmtxt='Security ID=1234'""
Invoke-Expression $cmd 

This of course fails. I tried to escape the quotes (single and double) using the escape character ` and did various combination, but nothing is working.

This question is tagged with powershell-2.0

~ Asked on 2013-08-08 00:50:24

The Best Answer is


Escaping parameters like that is usually source of frustration and feels a lot like a time wasted. I see you're on v2 so I would suggest using a technique that Joel "Jaykul" Bennet blogged about a while ago.

Long story short: you just wrap your string with @' ... '@ :

Start-Process \\server\toto.exe @'
-batch=B -param="sort1;parmtxt='Security ID=1234'"

(Mind that I assumed which quotes are needed, and which things you were attempting to escape.) If you want to work with the output, you may want to add the -NoNewWindow switch.

BTW: this was so important issue that since v3 you can use --% to stop the PowerShell parser from doing anything with your parameters:

\\server\toto.exe --% -batch=b -param="sort1;paramtxt='Security ID=1234'"

... should work fine there (with the same assumption).

~ Answered on 2013-08-08 07:18:45


Using the backtick (`) works fine for me if I put them in the following places:

$cmd="\\server\toto.exe -batch=B -param=`"sort1;parmtxt='Security ID=1234'`""

$cmd returns as:

\\server\toto.exe -batch=B -param="sort1;parmtxt='Security ID=1234'"

Is that what you were looking for?

The error PowerShell gave me referred to an unexpected token 'sort1', and that's how I determined where to put the backticks.

The @' ... '@ syntax is called a "here string" and will return exactly what is entered. You can also use them to populate variables in the following fashion:

[email protected]'
"\\server\toto.exe -batch=B -param="sort1;parmtxt='Security ID=1234'""

The opening and closing symbols must be on their own line as shown above.

~ Answered on 2013-08-19 12:16:05

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