|Red Hat Linux 7.1: The Official Red Hat Linux Customization Guide|
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To learn more about gathering system information, refer to the following resources.
ps --help — The ps --help displays a list of options that can be used with ps.
top manual page — Type man top to learn more about top and its many options.
free manual page — type man free to learn more about free and its many options.
df manual page — Type man df to learn more about the df command and its many options.
du manual page — Type man du to learn more about the du command and its many options.
/proc — The contents of the /proc directory can also be used to gather more detailed system information. Refer to the Official Red Hat Linux Reference Guide for additional information about the /proc directory.