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.mongorc.js File
All command line option flags can be coded into a file, mongorc.js (https://docs.mongodb.com/manual/reference/program/mongo/#files). When you run the mongo command, this file is parsed unless you include the command line switch mongo --norc. There are two primary locations for this file; the user home directory, or the operating system's /etc directory:
It is very important to set the rights properly if using /etc/mongorc.js. Otherwise, you will receive a permissions error when the mongo shell first starts. The recommended rights would be to assign ownership to the user mongodb, and read + execute rights to all others.
Here is a sample mongorc.js file, which customizes the prompt (https://docs.mongodb.com/manual/tutorial/configure-mongo-shell/) to display the database, hostname, and up time:
If you have defined both a global /etc/mongorc.js as well as a ~/.mongorc.js config file in the user home folder, the global file will be processed first. Another important consideration is that if the user uses the --norc option, it only suppresses execution of the local home directory file, not the global mongorc.js file.