Windows – Set environment variable to output of command in Windows command prompt

To do it without a temp file you can do:

@ECHO off
FOR /F %%i in ('powershell.exe -noprofile "(get-date).DayOfWeek"') DO SET dow=%%i
ECHO Day of week %dow%
PAUSE

from the command prompt remove the double %%:

FOR /F %i in ('powershell.exe -noprofile "(get-date).DayOfWeek"') DO SET dow=%i

Using -noprofile will make it run faster if you have a profile set up for PowerShell.

Windows has two classes of environment variables system environment variables and user environment variables. If you are using echo %PATH% you will see your user environment variable PATH. Only if there is no user variable defined, the system variable will be in effect for user processes.

The PATH separator ; should not be followed by a blank.

The following Microsoft note might be helpful:

You can modify user environment variables by editing the following Registry key:

   HKEY_CURRENT_USER \ 
         Environment

You can modify system environment variables by editing the following Registry key:

   HKEY_LOCAL_MACHINE \ 
               SYSTEM \ 
    CurrentControlSet \ 
              Control \ 
      Session Manager \ 
          Environment

Note that any environment variable that needs to be expanded (for example, when you use %SYSTEM%) must be stored in the registry as a REG_EXPAND_SZ registry value. Any values of type REG_SZ will not be expanded when read from the registry.

Additional remark: Whenever a process changes its environment (rather than the registry settings which define the environment for new processes), the changes are only visible for child processes.