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.
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:
grep -sq "" filename && command
grep can be used in combination with && to run a command if a file exists.
* ps -ef # list running processes
* grep string
* pull the process names from 8th field
* cut and delimiter '/'
* print 4th field
* get rid of trailing grep
* for loop killall -9 $i which is the process name
Its very useful when you do not have control over name servers and need to check DNS configuration directly, right after change. You will not need to wait for DNS propagation to verify if all records were configured properly by vendors of name servers.
It suspends to RAM: you always need your batteries for the RAM but it saves time as there is no need to slowly archive everything on your hard disk.
It works fine with me but if anyone has a nicer way, please contribute.
Make a signature.
Encrypt for user id name.
This is the quick and dirty alternative ;)
The whole file will be emptied, this is equal to /dev/null > ~/.ssh/known_hosts
to unload Daemon, use: launchctl unload /Library/LaunchDaemons/.plist
eliminates "l" and "o" characters change length by changing 'x' here: cut -c 1-x
Values will depend on the driver and the hardware specifics, so you need to refer to your driver documentation for proper interpretation of those values.
Very simple and useful, you need to change the word "directory" for your directory
This deals nicely with files having special characters in the file name (space ' or ").
Parallel is from https://savannah.nongnu.org/projects/parallel/
The preferred way for scripts (and easier to parse)