Four Frequently Used Junos Configuration Commands
Configuration mode provides four commands – edit, top, up, and exit – for moving up, down and through the Junos hierarchy. Apply these commands precisely where they belong. You will use them again and again.
edit: Jumps you to an exact location that you specify within the hierarchy in which you are currently working. You issue the relative path based on your location in the hierarchy:
[edit system] wiley@netnik# edit syslog host log [edit system syslog host log] wiley@netnik#
You can only move up and down a particular hierarchy — not across the hierarchies — with the edit command. To move to another hierarchy, you must first go back to the top of configuration mode to the edit banner.
top: Moves you instantly to the top of the configuration hierarchy.
[edit system syslog host log] wiley@netnik# top  wiley@netnik#
Combine top and edit to quickly move to a new hierarchy location:
[edit protocols ospf area] wiley@netnik# top edit system login [edit system login] wiley@netnik#
up: Takes you up one level in the configuration hierarchy. You can append a number to specify how many levels, for example, up 4.
exit: Returns you to the hierarchy point prior to the last edit command.