dump process information
usage:
chmod +x process_info_dump.sh # assign executable permission
# see usage message
./process_info_dump.sh --help
# see count information of "fds" and "tasks" in each process
./process_info_dump.sh
# see verbose information of "fds" and "task" in each process
./process_info_dump.sh --verbose
# see addtional "maps", memory mapping, information
./process_info_dump.sh --verbose --show-maps