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truss -xall -vall -rall -t'read' -p PID # To run a command and have it produce debug info, run it prefix with the truss syntax: truss -xall -vall -rall -t'read' your command # Another good option when debugging, is to run truss and look at the opens. Or more specifically the failures - as this often highlights missing libraries or permissions issues. truss -t'open' -p PID # - On Linux use strace, which takes basically the same options. You just use -e, like this:
strace -e'open' ls
open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
open("/lib/tls/librt.so.1", O_RDONLY) = 3
open("/lib/libtermcap.so.2", O_RDONLY) = 3
open("/lib/libacl.so.1", O_RDONLY) = 3
open("/lib/tls/libc.so.6", O_RDONLY) = 3
open("/lib/tls/libpthread.so.0", O_RDONLY) = 3
open("/lib/libattr.so.1", O_RDONLY) = 3
open("/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE) = 3
open(".", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
open("/etc/mtab", O_RDONLY) = 3
open("/proc/meminfo", O_RDONLY) = 3
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