On Mar 11, 2026, at 11:39 AM, Guillaume Gaullier via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:

Hi Rosy,

Clicking the link in the Log will open the help page for this command,
which starts with showing the typical syntax with which to run the
command. In this notation, square brackets denote optional keywords, but
you should not write them in your command. This is explained if you
click the "Usage" link just above the command syntax.

Quoting the relevant part of the "Usage" help page:

"- optional keywords and parameters are referred to as options or are
enclosed in square brackets: [ ]
- mutually exclusive choices are separated by a vertical bar: |
- mutually exclusive choices of a required item are grouped with
parentheses: ( )

These brackets, vertical bars, and parentheses in Usage lines are merely
symbolic and should not be included in the typed command."

In brief: try writing your command without the brackets and it should work.

I hope this helps!
Cheers,

Guillaume


On 11/03/2026 19.09, Rosaleen Calvert via ChimeraX-users wrote:

Hi Chimerax
*interfaces select <help:user/commands/interfaces.html#select> #1/A
contacting #1/B **[bothSides true][probeRadius 1.4][area Cutoff 3500]*
*Expected a keyword*

What keyword is required?
Have I supplied enough info?

Kind Regards
Rosy Calvert


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