A print job you submitted is stuck and you want to remove it from the CUPS queue. Which pair of commands finds the job id and then deletes that job?
LPIC-1 Exam 102-500, objective 108. Essential system services medium
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The options
Not correct lpstat -t then cupsreject
Wrong on the second half. cupsreject stops a destination from accepting new jobs; it does not delete a job that is already queued.
Not correct lpr -l then lpc delete
Wrong. lpr submits a job rather than listing anything, and `delete` is not an lpc subcommand in the CUPS implementation.
Correct lpq then lprm
Correct. lpq lists the queue with each job's id, and lprm removes a job by that id (or removes your current job when given no argument).
Not correct lpstat -p then lpmove
Wrong for deleting. lpstat -p reports printer state, and lpmove transfers a job to another destination rather than cancelling it.
Why
CUPS ships both the Berkeley-style tools (lpr, lpq, lprm) and the System V ones (lp, lpstat, cancel), and they operate on the same queues. lpq shows the jobs for a destination, lprm removes one by id, and `cancel -a printer` clears a whole queue. lpstat is the general status command: -p for printers and their state, -o for outstanding jobs, -t for everything at once.
Where this comes from
- Cited
- LPI exam objective 108.4
- What it says
- Manage print queues and user print jobs with the CUPS command-line tools.
Practise this
Reading one question is not practice. The trainer will draw a set from objective 108 and space the ones you get wrong.