Write command line variable into text file

I've got as far as I can with this one, but struggling at the last hurdle.

I am attempting to get the uptime of my Windows 7 machine, load it into a variable, trim the current time from the left part of the variable and then write it back from a variable into a .txt file.

All works just fine, except I do not know how to write the variable back into a text file.

Here is what I have:

uptime.exe > uptime.txt
set /p str=<uptime.txt
set str=%str:~-16%

Now the last echo line displays exactly what I want, but how do I write that variable back into uptime.txt?

Thanks in advance for any assistance.


You can simply redirect standard output to the file of your choice to achieve your goal. For example:

echo %<name of environment variable>% > <path of file>
echo %str% > uptime.txt

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