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Printing and Process Commands

Since UNIX is a multi-tasking system, there are a number of commands used to suspend and restart jobs, run processes in the background, and send information to a printer for output. (More detailed information about the printers can be found in Files/Printing.) Listed below are some of the most useful commands for working with processes and printing:

• ps - lists all of your current processes.
• command & - puts a process in the background. The shell can deal with n processes at once, of which at most one is run in the foreground.
• kill - stop a background process from continuing with kill processID. The process ID (PID) number is listed in the left column when you invoke ps. The computer may choose to ignore some kill commands (such as killing one's own shell), but kill -kill PID is a sure murder). Kill current process with CTL-c.
• who - lists all the users who are logged on.
• finger - find out interesting information about specific users. You can also finger people off-campus, provided you know their computer addresses.
• lookup - find room and phone numbers of Princeton staff and students through the on-line campus phone book.
• lpr - type lpr filename to send the file to a printer queue for printing. Use the option d to print a DVI file.
• lpq - lists the jobs that are currently on the queue.
• lprm - remove a job from the queue by typing lprm job# (the job number is given by the lpq command). lprm will not work for any of the Suns except Lyman. Contact the super-user (Charles Karney) with any problems.

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