man pages:

  • img_1
  • img_2
  • Press h to get help on navigation, press q to quit and return to the command prompt, use the Up and Down arrow keys to scroll up and down, and the PgUp and PgDn keys to scroll one page at a time.
  • KEYS WHICH CAN HELP IN NAVIGATION:
    • img_3

apropos command:

  • It is alias of the command man -k {half_remembered_cmd_name} → This command allows us to perform keyword search on manual pages incase we have forgot what the command name is.
Note

Before we run the keyword search we need to run the command mandb

  • Once you have identified the command you were looking for, you can check that command’s manual pages for usage.

--help :

  • Some commands also support the use of the –help and -? parameters. These parameters provide a brief list of options and a description without going through the manual pages. For example, to get quick help on the passwd command, run either passwd –help or passwd -?

Short description:

  • The whatis command searches for a short description of the specified command or file in the manual database. It quickly scans through the installed manual pages for the specified string and displays all matching entries. img_4
  • You may alternatively run man -f yum.conf and man -f passwd for the exact same results. Both man -f and whatis produce identical output.

Documentation in the /usr/share/doc directory:

  • Checking the documentation of gzip img_5

RHEL portal:

  • The website at docs.redhat.com hosts documentation for Red Hat’s various products including RHEL 9 in HTML, PDF, and EPUB formats.