sshd is OpenSSHD Daemon. When sshd receives a request for connection from a client, it creates a new process for that particular connection. You can use either password or key exchange authentication (there are others types too).

Typically this daemon gets the configuration parameters from the /etc/ssh/sshd_config file. But, you can also specify the options from the command line, in which case, it overrides the parameters from the sshd_config file.
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xinetd stands for extended Internet services daemon. This is a replacement for inetd. xinetd starts and listens on all the service ports that you’ve defined, and when there is an incoming request to a particular port that it is listening to, it starts the corresponding service.
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uuencode command is used to encode a binary file as explained in the examples below.
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uudecode command is used to decode the ASCII representation that was created by the uuencode command. Please note that uuencode command encodes a binary file to ASCII text.
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After you’ve partitioned a hard disk, you can use mkfs command is used to build a Linux filesystem. This article explains 5 practical examples on how to use this command.

Please be careful while executing this command, as this will destroy all data on the device. So, use this only on your test system to understand how this command works.
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