prctl(1): Duplicate information in the man page
manpage - manual pages
Similar sentence is twice in the prctl(1) man page:
OPTIONS If none of the -s, -r, -x, -v, -d, or -e options are speci- fied, the invocation is considered a get operation. Other- wise, it is considered a modify operation.
If none of the -d, -e, -v, or -x options is specified, the invocation is considered a get operation. OPERANDS
The second sentence should be removed.