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To learn more about gathering system information, refer to the following resources:
ps --help — Displays a list of options that can be used with ps.
/proc — The contents of the /proc directory can also be used to gather more detailed system information. See Chapter 23 for more information about the /proc directory.
top manual page — Type man top at a shell prompt to learn more about top and its many options.
free manual page — Type man free at a shell prompt to learn more about free and its many options.
df manual page — Type man df at a shell prompt to learn more about the df command and its many options.
du manual page — Type man du at a shell prompt to learn more about the du command and its many options.
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