Question: Someone sent me a *.chm file. I don’t have windows machine. Is it possible to view a *.chm file on a Linux system.?

Answer: Use kchmviewer to view chm files as explained below.
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When you execute a Unix job in the background ( using &, bg command), and logout from the session, your process will get killed. You can avoid this using several methods — executing the job with nohup, or making it as batch job using at, batch or cron command.
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Tee command is used to store and view (both at the same time) the output of any other command.

Tee command writes to the STDOUT, and to a file at a time as shown in the examples below.
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Using gpg you can generate private and public keys that can be used to encrypt and decrypt files as explained in this example.
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od command dumps a file in octal, decimal, and other formats.
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First, find the volume size and the block size of the CD or DVD as shown below using isoinfo command.
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How to burn a dvd ?

Syntax: growisofs -dvd-compat -Z {device-path}={iso-file}

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How to burn a CD ?

Syntax: cdrecord -V -eject dev={device-file-path} {iso-file}

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Comm command is used to compare two sorted files line by line.
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How to rar a single file ?

syntax: rar a {.rar file-name} {file-name}

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