All GROMACS programs do not check if the first argument after the binary name starts with a dash. Any non-dash arguments are ignored until one with a dash is encountered. This is especially an issue when cut-and-pasting from PDFs where all arguments can be ignored. *(from redmine: issue id 2153, created on 2017-04-12 by berkhess, closed on 2018-01-10)* * Changesets: * Revision 5577aadf5600f0adfa84a8b58e15007703bfa424 by Mark Abraham on 2018-01-10T08:47:19Z: ``` Handle erroneous command line args better Some gmx modules need to be able to accept non-option arguments, and some should not. Introduced enough functionality to support such behaviour, while giving useful error messages in cases where the command line is merely missing hyphens (which can happen e.g. when people copy-paste from inconveniently built PDF files for tutorials). Increased test coverage of relevant cases. Removed some useless command-line argument strings from test cases that never needed them. Also tested some behaviours of handling string options, and renamed some test input strings to reflect the intent. Fixes #2153 Change-Id: Icec02ea86a57a8b129a621121518036b9f032078 ```