commandlinefu.com is the place to record those command-line gems that you return to again and again.
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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
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This command line creates a new user with home directory, using the command "useradd". The command "mkpasswd" lets you encrypt the password e.g. with SHA-512 method. This line ensures that your password is written encrypted in /etc/shadow" so you can log in with the new user.