Batch file / Lock file

I have a batch file that that runs a Lock File batch file. the output goes to a randomly created .txt file. the line in the LockFile.txt file looks like this:

lock ok 1305563264_75810992


## the LockByHost.bat unlock server needs to read that line without the "lock ok" part, and end up like this:
call lockByHost.bat unlock server 1305563264_75810992

How do i strip the code from the .txt file, leave the "lock ok" part out and insert it at the end of the unlock command? I'm not sure how to strip text from a .txt file and insert it into a batch file. is there a way? or should i call a script that reads the line from that .txt file?

Any advice would be appreciated.