"Having trouble figuring out why Apache isn't starting, or
another program is crashing and burning, and the logfiles are
giving no clue? Time to reach for strace.
"What's strace? The strace utility is used to run a command and
display its system calls, so you can see exactly what the program
is doing until it exits. Experienced users can work with strace to
do performance testing and so on, but even beginners can use strace
as a diagnostic tool to see why a program is crashing."