S2CATQUAL is controlled by the following 10 commands
? : Brief list of commands
EXIT or QUIT : Leave S2CATQUAL and output catalogue
HELP : Bring up this help page
LIST : List current record selection
QHELP : List valid quality flag names
RECS : Select records by number
RESET : Reset bits of selected records
SET : Set bits of selected records
SIF : Select records with specified bits set
SNIF : Select records with specified bits not set
A is a list of record numbers. Eg. 1,2,3 or 1:4. Use
ALL to specify all records.
A is a list of one or more quality flag names, separated by
commas