It normaly should be done from privileged EXEC mode:
show startup-config for viewing startup configuration file, settings which will be loaded on reboot of equipment.
show running-config for viewing running configuration, settings which are currently in memory of equipment. If they are not saved, they will be lost on reboot.
Short versions are
sh start
and
sh run
To navigate through start or running configuration view, you can use
ENTER – next line
SPACE – next page
ESC – quit
To save current running configuration to startup file
copy running-config startup-config
or
copy run start
