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LinuxPlanet: Major Tom, This is Job Control

Jul 27, 2000, 14:38 (0 Talkback[s])
(Other stories by Jay Fink)

[ Thanks to Kevin Reichard for this link. ]

"Job control and scheduling is quickly becoming less and less of an issue for most Linux users and administrators. Virtually all scheduling is done (justifiably so) via cron. However, I have come across many occasions as of late where using job control and processing techniques is quite handy. This article will look at two aspects of job control: first, priority scheduling and altering priorities with nice and renice, respectively; second, batch processing and scheduling using batch, at, and cron, respectively."

"Many UNIX users are very familiar with nice and renice, and as they pertain to job control they deserve mention within this context. The nice command is used to alter an initial job priority. On Linux systems this is fairly simple: the lower the nice command the higher the priority. The range on a Linux system is -20 (being the highest) to 19 (the lowest). Using nice is pretty simple. Let's say we want to make sure that a compile and install for fetchmail has a pretty high priority. We might do the following: nice -n 5 make"

"We have lowered the nice number and raised the job priority initially for this task."

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