[swagiaal@toner x86_64]$ ferror -e "invalid" -- /usr/local/bin/ferror -e "xxx" -- /usr/bin/firefox Tracing 18581.18581 Tracing 18581.18582 Error: invalid `Elf' handle Process is trying to output invalid Stack trace: Task #18581 #0 0x00000030f600d2cb in __libc_write () from .../libpthread-2.7.so #1 0x0000003124bf9114 in void gnu::java::nio::channels::FileChannelImpl::write(JArray<char>*, int, int) () from .../libgcj.so.8rh.0.0 #2 0x0000003124fba38f in void java::io::FileOutputStream::write(JArray<char>*, int, int) () from .../libgcj.so.8rh.0.0 #3 0x0000003124fb3e78 in void java::io::BufferedOutputStream::flush() () from .../libgcj.so.8rh.0.0 #4 0x0000003124fc9791 in void java::io::PrintStream::flush() () from .../libgcj.so.8rh.0.0 #5 0x0000003124fc9827 in void java::io::PrintStream::print(java::lang::String*, bool) () from .../libgcj.so.8rh.0.0