Print total charge for selected atoms.

charge [parm <name>  | parmindex <#> | <#>] <mask> [out <file>] [name <set>]

parm <name> | parmindex <#> Topology to calculate charge from.
<mask> Atom(s) to calculate total charge for (default all).
[out <file>] File to write total charge to.
[name <set>] If specified, a data set named <set> will be created containing total charge.

Print the total charge of atoms in <mask> (in units of electron charge) for selected topology (first loaded topology by default).