Windbg: Creating log of function entry and exit

I wish to create log of function entry and exit for my code. I am using the following command in WinDbg- Function name and the return value

bm <module_name>!* "kcL1;.echotime;gu;r eax;.echotime;gc;"

Now I wish to do this for all the modules of the function but I don't want to write the code again for each module. Is there some way to specify bm to read module names from a file which I create using "lm" and set breakpoint for each module or something even more simple.

Also, how can I specify bm to not print the output on the screen? I am using a log file.

Sometimes I don't see the time for call exit. What can be the reason for this? How can I correct it?