When executing the show running-config (show run) command on Cisco ISO, the output will be paged through one screenful at a time. This is useful as Cisco configs can be very long and can have thousands of lines. It would be impractical to dump the whole config to screen and expect the admin to rely on their scroll buffer. However admins like to have freedom to choose, to execute show run with out more you can use this method.
# terminal length 0 # show running-config
If you are not enable you can test your terminal length setting with a command like show version.
The terminal length command is where you set the number of lines to display per screen, 0 means no limit, however you could use this setting to show, say, 5 lines at time.
Once this command has been executed it will disable paging (more) for all output in the current session. Next time you login more paging will be enabled again.
terminal length ? <0-512> Number of lines on screen (0 for no pausing)