commandlinefu.com is the place to record those command-line gems that you return to again and again.
Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.
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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.
» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10
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,…):
Subscribe to the feed for:
Useful for grepping an IP range from the maillog. When for instance dealing with a spam-run from a specific IP range, or when errors occur from or to a specific IP-range.
In the example above the IP range 183.0.0.0/10 (183.0.0.0 - 183.63.255.255)
To grep the IP range 124.217.224.0/19 (124.217.224.0 - 124.217.255.255) from the maillog:
egrep '124\.217\.2(2[4-9]|[34][0-9]|5[0-5])' -J /var/log/maillog*
NOTE: the location of the maillog may vary based upon operating system and distribution.