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,…):
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There are several other options. This one is plain and simple.
Another option is:
nmap -sP 192.168.0.0/24
This is a simple BASH script which with gather basic system hardware such as CPU sockets and cores, Memory modules and sizes as well as overall memory and more.
Root access may be needed to pull information from 'dmidecode'
Cracking a password protected .rar file in a line, by dictionary attack method. All you need is a good dictionary (dict.txt).
Judging by the quality of suggestions lately I thought I'd better join in
This will launch a listener on the machine that will wait for a connection on port 1234. When you connect from a remote machine with something like :
nc 192.168.0.1 1234
You will have console access to the machine through bash.
creates a large number of processes very quickly in order to overload an OS
to stop this bomb in about 45 sec.
Type: while (sleep 100 &!) do; done
or do a killall
This will completely erase everything on your hard drive and is not reversible.
!whatever will search your command history and execute the first command that matches 'whatever'. If you don't feel safe doing this put :p on the end to print without executing. Recommended when running as superuser.