LPI Linux certification in a nutshell : a desktop quick by Jeffrey Dean; Linux Professional Institute
By Jeffrey Dean; Linux Professional Institute
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This is useful in situations in which you need to watch the status of one or more processes or to see how they are using your system. In addition, a header of useful uptime, load, CPU status, and memory information is displayed. By default, the process status output is generated with the most CPUintensive processes at the top of the listing (and is named for the “top” processes). In order to format the screen, top must understand how to control the terminal display. The type of terminal (or terminal window) in use is stored in the environment variable TERM.
This is useful in situations in which you need to watch the status of one or more processes or to see how they are using your system. In addition, a header of useful uptime, load, CPU status, and memory information is displayed. By default, the process status output is generated with the most CPUintensive processes at the top of the listing (and is named for the “top” processes). In order to format the screen, top must understand how to control the terminal display. The type of terminal (or terminal window) in use is stored in the environment variable TERM.
F “Forest” mode, which is used to display process family trees. * –l Long format, which includes priority, parent PID, and other information. * There is also a separate command called pstree that does this nicely. 12117 Page 47 Tuesday, October 9, 2001 1:46 PM –u User format, which includes usernames and the start time of processes. –w Wide output format, used to eliminate the default output line truncation. Useful for the –f option. –x –C cmd Display instances of command name cmd. –U usr Display processes owned by username usr.