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.