Question

I need to run

start cmd.exe /k "C:\Program Files (x86)\Mozilla Firefox\sdk\bin\activate & cd d:\home\name\addon\ & cfx run"

The problem is that first path has spaces (Program Files). I can’t use quotes, because they are used for full command already.

How can I use spaces in this command?

Answer 1

Who says you can’t add quotes around the exe path when the /C command is already quoted? It works fine ! 🙂

start cmd.exe /k ""C:\Program Files (x86)\Mozilla Firefox\sdk\bin\activate" & cd d:\home\name\addon\ & cfx run"

The outer quotes around the /C command are removed prior to execution, leaving only the quotes around your exe path. You can read about how CMD process quotes in the help. Simply type CMD /? or HELP CMD from a command prompt. It does get confusing.

If /C or /K is specified, then the remainder of the command line after
the switch is processed as a command line, where the following logic is
used to process quote (") characters:

    1.  If all of the following conditions are met, then quote characters
        on the command line are preserved:

        - no /S switch
        - exactly two quote characters
        - no special characters between the two quote characters,
          where special is one of: &<>()@^|
        - there are one or more whitespace characters between the
          two quote characters
        - the string between the two quote characters is the name
          of an executable file.

    2.  Otherwise, old behavior is to see if the first character is
        a quote character and if so, strip the leading character and
        remove the last quote character on the command line, preserving
        any text after the last quote character.

Your command has more than 2 quotes, so option 2 is followed.

The only time the above won’t work is if your exe name contains a special character like &, for example this&that.exe. That causes a problem because the exe name is not quoted when the START command is initially parsed. That can be fixed by escaping the problem character within the file name.

start cmd.exe /k ""this^&that.exe" & echo something else"