This script spiders through an entire project to find each function and visually display how each function calls other functions. This can be helpful to optimize a script after you realize how many times a function is called.
[epijunkie@bhost] ~/project# ./project-function-hierarchy.sh __info
__info
__return_pools_active
__gvset_guest_pool
__verify_valid_pool
__setup
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__return_chyves_zfs_property_value
__return_new_line_delimit_as_space_string
__return_guest_list
__load_guest_parameters
__gvset_guest_pool
__verify_valid_pool
__setup
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_guest_dataset_mountpoint
__get_guest_console_pid
__return_guest_vmm_allocated
__return_guest_bhyve_pid
__return_rcboot_priority
__return_chyves_zfs_property_value
__gvset_first_disk
__return_guest_disk_list
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value[epijunkie@bhost] ~/project# ./project-function-hierarchy.sh
__preflight_check
__load_library_files
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__log
__log
__return_cpu_section_from_dmesg
__return_cpu_section_from_dmesg
__return_cpu_section_from_dmesg
__log
__log
__log
__return_cpu_section_from_dmesg
__fault_detected_exit
__log
__log
__gvset_primary_pool
__verify_valid_pool
__setup
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__log
__fault_detected_exit
__log
__log
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_new_line_delimit_as_comma_string
__return_guest_list
__return_new_line_delimit_as_grep_string
__return_guest_list
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__return_chyves_zfs_property_value
__verify_kernel_module_loaded
__verify_kernel_module_loaded - [WARNING] Infinite loop [WARNING]
__fault_detected_exit
__log
__log
__parse_cmd_ingress
__parse_cmd_dataset
__root_credentials_required
__fault_detected_exit
__log
__log
__verify_number_of_arguments
__help
__version
__fault_detected_exit
__log
__log
__verify_valid_pool
__setup
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__dataset_install
__log
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__log
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__set_chyves_zfs_property
__log
__log
__log
__resource_import
__verify_valid_dataset
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__log
__log
__log
__log
__log
__log
__log
__log
__log
__log
__log
__resource_functions
__log
__log
__log
__verify_valid_dataset
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__log
__log
__log
__log
__log
__log
__resource_functions
__log
__return_one_if_freenas
__verify_valid_pool
__setup
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__dataset_offline
__verify_valid_pool
__setup
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__dataset_online
__verify_valid_pool
__setup
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__dataset_promote
__verify_valid_pool
__setup
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__dataset_delete
__verify_valid_pool
__setup
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__dataset_upgrade
__help
__version
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__parse_cmd_resources
__list_firmwares
__list_iso
__verify_number_of_arguments
__help
__version
__fault_detected_exit
__log
__log
__verify_valid_dataset
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__resource_delete
__log
__verify_number_of_arguments
__help
__version
__fault_detected_exit
__log
__log
__resource_import
__verify_valid_dataset
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__log
__log
__log
__log
__log
__log
__log
__log
__log
__log
__log
__resource_functions
__log
__log
__log
__verify_valid_dataset
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__log
__log
__log
__log
__log
__log
__resource_functions
__verify_number_of_arguments
__help
__version
__fault_detected_exit
__log
__log
__verify_valid_dataset
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__verify_valid_dataset
__fault_detected_exit
__log
__log
__fault_detected_exit
__log
__log
__resource_rename
__log
__help
__version
__verify_number_of_arguments
__help
__version
...thousands more lines...