Editing IDF from the command line

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Just to throw in more options, you can write an OpenStudio EnergyPlus measure; this is a measure that alters an IDF file instead of an OSM file. If you save an OSW file (simple JSON file describing one or more measures and the argument values) you can run that from the command line using the OpenStudio CLI. It can just produce the IDF file, or it can also run the simulation and any reporting measures you might want.

If you really wanted to do this, you might choose epJSON instead of IDF and then use a JSON command-line tool (here are several for example) for JSON manipulation.