History and Replacement

Search history

Ctrl+r (enter search)
Ctrl+r (again to find previous occurrences)
Enter to stop searching and dump what you found to prompt
ESC to abort

Replace first occurrence of a word in last command

^findthis^replacewiththis^

Replace all occurrences of a word in last command

!!:gs/findallofthese/replacewiththis/

Navigate history

CTRL+p - Previous command
CTRL+n - Next command
ARROW KEYS - you can also use the arrow keys but the CTRL shortcuts keep you from having to remove your hands from the home keys

Loops

for i in *.json; do knife environment from file $i; done

OSX Specific

Networking

Show routing table

netstat -nr