There are some commands that are officially no longer supported by Cisco, but that still work on most devices. A few of these commands are shorter than their modern-day replacements, so using them can speed up your configuration. Some commonly used ones include:
Old Command
wr (write memory)
wr er (write erase)
who
whe (where)
New Command
copy run start (copy running-config startup-config)
erase start
show users
show sessions
Source: Global Knowledge Training 
