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Command Description

Here is a brief description for a number of commands. For more information, type at the prompt

command name

whatis or man

command name

• Gzip/Gunzip;Compress;Bzip2/Bunzip2

  File Compressor. It works similarly as PkZIP.

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  • cpio

    Manage archives of files. It copies files into or out of a cpio or tar archive(extension is tar).

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    • who/whoami

      Give information about who is logged in the system.

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      • rpm

        Install and remove packages in the rpm format. When installing rpm packages, use --nodeps and --force switches.Use rpmtgz to convert .rpm to .tgz packages.

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        • su/sudo

          It allows users to assume the root or superuser status.

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          • cat

            Concatenate files and print on the standard output.

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            • cut

              Remove sections from each line of files.

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              • chown

                Change file owner and group.

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                • date

                  Output the current date and time.

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                  • dd

                    Convert and copy a file or imaging similarly to the DOS based program rawrite.

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                    • df

                      Output physical memory information.

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                      • du

                        Estimate file space usage.

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                        • kill

                          Report process status.

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                          • killall

                            Kill process by name.

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                            • ps

                              Report process status.

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                              • login

                                Prompt to enter user name and password.

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                                • clear

                                  Clear the screen.

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                                  • mail

                                    Send an receive mail.

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                                    • more

                                      Filter for paging text one screenful at a time.It may be used alone or with a command and a pipe.

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                                      • mount/umount

                                        Mount/umount a file system or device. It is used to mount hard drives, floppy and CD-ROM drives. The common synstax for mount is "mount /dev/whatever /mnt -t filesystem type" and umount /mnt

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                                        • tar

                                          Archive/unarchive files. Use cvf to archive files and/or directories and xpvf to unachive them.