Open Babel

GZipped Files

Open Babel deals with GZipped input files automatically, whether the .gz extension is present or not.

For writing files, however, the .gz extension is not enough, and the -z option need to be used explicitly:

obabel -i<INPUT_EXTENSION> <INPUT_FILE> -o<OUTPUT_EXTENSION> -O <OUTPUT_FILE> -z

<OUTPUT_FILE> needs to specify the .gz extension explicitly, since it is not appended automatically.