Write command line variable into text file

Question

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:

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

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.

Man, I'm sure I tried that!! Do you want to list it as an answer and I'll accept it? Jeeeez i feel dumb now! Thanks! — omega1
– omega1, Commented Feb 3, 2014 at 11:29
cant you write that output in different file and read new file? — Nachiket Kate
– Nachiket Kate, Commented Feb 3, 2014 at 12:01
>uptime.txt echo %str% <--- that method eliminates the need for trailing spaces. — foxidrive
– foxidrive, Commented Feb 3, 2014 at 12:29

user3613932 · Accepted Answer · 2017-07-25 19:40:56Z

2

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

answered Jul 25, 2017 at 19:40

user3613932

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