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Expected:

I am trying connect to host using putty in windows command line to execute the list of commands in cmds.txt and save the logs in putty.log, where it has to be created if not exists or it has to be reused, without prompting:

"C:UsersUser1Desktopputty.exe" -ssh "10.10.10.10" -l "user1" -pw "passw0d" -sessionlog "C:UsersUser1Documentsputty.log" -m "C:UsersUser1Documentscmds.txt"

Actual:

But, it throws exception that file not exists or prompts for reusing the existing file!

In GUI, we can specify like “&H-&Y&M&D-&T.log” for unique session logs in session logging.

How to specify to create log file silently or reuse log file without prompt in command line?

According to man putty there is no option to force putty to reuse the log file.
Try one of these ideas:

• 
  

  You could remove the file before running putty.

  
  
  

  rm -f "~/Documents/putty.log"; putty -ssh "10.10.10.10" -l "user1" -pw "passw0d" -sessionlog "~/Documents/putty.log" -m "~/Documents/cmds.txt"
  
  

  
  


• 
  

  You could add a timestamp to the log file (this is a bash example).

  
  
  

  putty -ssh "10.10.10.10" -l "user1" -pw "passw0d" -sessionlog "~/Documents/putty-$(date +%s).log" -m "~/Documents/cmds.txt"