Work function for validatectl
| 1 | validate1(ctl, ctlname, expectcols, rqdcols)
 | 
| ctl | Control file structure | 
| ctlname | Name of the control file we're testing (used in error messages) | 
| expectcols | Expected columns for this control file | 
| rqdcols | Columns for which data is required (no missing allowed) | 
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