Usage

Lprm will send a request to remove jobs from a spool queue. Lprm is normally the only method by which a user may remove a job. The jobs to be removed are specified by the job number or user name; with no specifiers the first removable in a queue will be selected for removal.

taurus[40]% lpr windoze.txt
taurus[41]% lpq
HPLaserJet is ready and printing
Rank    Owner   Job     File(s)                         Total Size
active  dan     182     windoze.txt                     3072 bytes
taurus[42]% lprm 183
taurus[43]% lpq
HPLaserJet is ready
no entries
taurus[44]% 

-P printer

Again, the -P flag is supported.