How to output to the last line of a file from a batch file

Question

I'm working on a batch file for my program's setup.

I want to make a log from the batch file that logs the run time and date I created:

     (
     echo Setup Run Log
     echo The setup was runned at %time% on %date% by %username%.
     )>run.log.

But every time the code runs it over writes the information in the file. I want that the first time the batch starts a run.log file to be created that has Setup Run Log and every other time the batch runs the time, date and username be written on the line below a line that already has something written.

My question: How to output to the last line in a file.

Answer 1

Instead of doing (command) > run.log, change your code to (command) >> run.log.

">" redirects and overwrites. ">>" appends the content.

More details about command redirection is at https://www.tldp.org/LDP/abs/html/io-redirection.html.