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You can manage the print queue using the lpq and lprm commands. The lpq command lists the printing jobs currently on the print queue. With the -P option and the printer name, you can list the jobs for a particular printer. If you specify a username, you can list the print jobs for that user. With the -l option, lpq displays detailed information about each job. If you want information on a specific job, simply use that job s ID number with lpq. To check the status of a printer, use lpstat. # lpq myepson is ready and printing Rank Owner Jobs File(s) active chris 1 report
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The lprm command enables you to remove a print job from the queue, erasing the job before it can be printed.
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The lprm command takes many of the same options as lpq. To remove a specific job, use lprm with the job number. To remove all printing jobs for a particular printer, use the -P option with the printer name. lprm with no options removes the job printing currently. The following command removes the first print job in the queue. # lprm 1
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CUPS provides command line administrative tools like lpadmin, lpoptions, lpinfo, enable, disable, accept, and reject. The enable and disable commands start and stop print queues directly, whereas the accept and reject commands start and stop particular jobs. lpinfo provides information about printers, and lpoptions lets you set printing options. The lpadmin command lets you perform administrative tasks like adding printers and changing configurations.
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lpadmin
You can use the lpadmin command to either set the default printer or configure various options for a printer. You can use the -d option to specify a particular printer as the default destination (you can also do this in redhat-config-printer). Here myepson is made the default printer: lpadmin -d myepson The -p option lets you designate a printer for which to set various options. The following example sets printer description information: lpadmin -p myepson -D Epson550
Certain options let you control per-user quotas for print jobs. The job-k-limit sets the size of a job allowed per user, job-page-limit sets the page limit for a job, and the job-quota-period limits the number of jobs with a specified timeframe. The following command sets a page limit of 100 for each user.
Print Servers
lpadmin -p myepson
-o job-page-limit=100
User access control is determined with the -u option with an allow or deny list. Users allowed access are listed 8 following the allow: entry, and those denied access are listed with a deny: entry. Here, access is granted to chris, but denied to aleina and larisa.
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lpadmin -p myepson -u allow:chris
deny:aleina,larisa
Use all or none to permit or deny access to all or no users. You can create exceptions by using all or none in combination with user specific access. The following example allows access to all users except justin. lpadmin -p myepson -u allow:all deny:justin
lpoptions
The lpoptions command lets you set printing options that govern how your print jobs will be printed. For example, you can set the color or page format to be used with a particular printer. Default settings for all users are maintained by the root user in the /etc/cups/ lpoptions file, and each user can create their own configurations, which are saved in their .lpoptions files. The -l option lists current options for a printer, and the -p options designates a printer (you can also set the default printer to use with the -d option). lpoptions -p myepson -l Printer options are set using the -o option along with the option name and value, -o option=value. You can remove a printer option with the -r option. For example, to print on both sides of your sheets, you can set the sides option to two-sided: lpoptions -p myepson -o sides=two-sided To remove the option, use -r: lpoptions -p myepson -r sides To display a listing of available options, check the standard printing options in the CUPS Software Manual at www.cups.org.
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