# Search directories above the current directory for one which contains
# $dir as a substring.  If found, cd to it.  If not found, do nothing.

# If starting out in the /usr/local/adnxs/api directory for each command...

$ up adnxs => you're in /usr/local/adnxs.
$ up nxs => you're in /usr/local/adnxs (nxs is in adnxs).
$ up foo => you stay put.

# List the current versions for AppNexus API endpoints.