Consider the following 4 invocations of logappend followed by an invocation of logread:

$ ./logappend -T 1 -K secret -A -E Fred log1
$ ./logappend -T 2 -K secret -A -G Jill log1
$ ./logappend -T 3 -K secret -A -E Fred -R 1 log1
$ ./logappend -T 4 -K secret -A -G Jill -R 1 log1

These commands have used the key secret to append 4 events to the log log1, recording the arrival of Fred and Jill in room 1 of the gallery. If logread is then used to print the state of the gallery, the following should be printed:

$ ./logread -K secret -S log1
1: Fred,Jill

If we continue using log1 and record some movements, we can then use logread to get a list of the rooms entered by Fred.

./logappend -T 5 -K secret -L -E Fred -R 1 log1
./logappend -T 6 -K secret -A -E Fred -R 2 log1
./logappend -T 7 -K secret -L -E Fred -R 2 log1
./logappend -T 8 -K secret -A -E Fred -R 3 log1
./logappend -T 9 -K secret -L -E Fred -R 3 log1
./logappend -T 10 -K secret -A -E Fred -R 1 log1
./logread -K secret -R -E Fred log1

We can also use logappend in batch mode like so (on a fresh log log2):

$ cat batch 
-K secret -T 1 -A -E John log2
-K secret -T 2 -A -R 0 -E John log2
-K secret -T 3 -A -G James log2
-K secret -T 4 -A -R 0 -G James log2
$ ./logappend -B batch 
$ ./logread -K secret -S log2