We need to launch Terminal program (in the Utilities under the Application folder) to get a terminal prompt. By default, the working directory of terminal window is the home directory. We can use 'pico .ncbirc' command line (without quotes) to create the .ncbirc file. The file should contain the following information:
[NCBI]
DATA=/Users/name/blast-2.2.15/data
[BLAST]
BLASTDB=/Users/name/blast-2.2.15/db
We can display the complete path for the current working directory using "pwd" command. Replace the path information with that returned by pwd if necessary.