You can delete fields using recset’s -d flag.
For example, if we wanted to delete the Inspected field which we introduced above,
we could do so as follows:
$ recset -t Item -f Inspected -d stock.rec
This would delete all fields named Inspected from all records of type
Item.
It may be that, we only wanted to delete the Inspected fields from records which satisfy
a certain condition.
The following would delete the fields only from items whose Expiry date was before
2 January 2010:
$ recset -t Item -e 'Expiry << "2 January 2010"' -f Inspected -d stock.rec