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Tip If no printer is specified for the lpr command, the default printer is used. This is determined by either the default_printer entry in lpd.conf, the PRINTER environment variable, or the first entry in the /etc/printcap file. You can also print directly to the printer by simply redirecting output to the printer's device file. This does not place anything on the print queue. The print operation becomes a command to be immediately executed. However, your system is occupied until the file completes printing. The following example uses this technique to print the report file to a printer connected to device lp1:
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$ cat report > /dev/lp1
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To manage the printing jobs on your printer or printers, you can use either Klpq or the LPRng clients lpc, lpq, and lprm. Klpq is a KDE desktop utility installed with Red Hat and labeled the Print Job Administration tool (see Figure 33-4). With Klpq, you can list the print jobs for a printer, remove a print job, and move a print job to the top of the queue. You can also disable printing for a printer. To have the print queue listing automatically updated, you can set an update frequency in the Options menu.
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Figure 33-4: Managing a printer queue with Klpq You can use lpc to enable or disable printers, reorder their print queues, and reexecute configuration files. To use lpc, enter the command lpc at the shell prompt. You are then given an LPC> prompt at which you can enter lpc commands to manage your printers and reorder their jobs. The status command with the name of the printer displays whether the printer is
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ready, how many print jobs it has, and so on. The stop and start commands can stop a printer and start it back up.
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# lpc lpc> status hp1 hp1|lp1: queuing is enabled printing is enabled 1 entry in spool area
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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 user name, 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 you use lpstat. With the lprm command, you can remove a printing job from the queue, erasing the job before it can be printed. 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 user, enter lprm with the user name. To remove all printing jobs for a particular printer, use the -P option with the printer name. The lprm command has a special argument indicated by a dash, -, that references all print jobs for the user who issues the command. For example, to remove all your own print jobs, enter lprm -. If you logged in as the root user, lprm - removes all print jobs for all printers and users from the print queue, emptying it completely. You should not use lprm to kill a printing job that has already started printing. Instead, you may have to use the kill command on the print job process. You can display processes using the ps -ax command, and then use kill and the number of the process to end it. For a job that is already printing, you see a process for its filter. This is the process to kill. If the process does not end, you can force its termination by using the s option and the kill signal number, 9. Table 33-5 shows various printer commands; Table 33-6 includes lpc commands. Table 33-5: Printer Commands Description KDE print queue management tool. Prints a file; copies the file to the printer's spool directory, and places it on the print queue to be printed in turn.Pprinter prints the file on the specified printer. Displays the print jobs in the print queue.-Pprinter prints queue for the specified printer.-l prints a detailed listing. Displays printer status. Removes a print job from the print queue; you identify a particular print job by its number as listed by lpq; if you use User-id, it removes all print jobs for that user.- refers to
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