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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.
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Will unmount a mount that has already dropped but is locked by a process.
cut -f1 -d\<TAB>
Old drive with lots of music or unsorted drive? This command will play all mp3 files in a folder and after playing one song or pressing q, it will ask you if you want to delete the file.
Calc the rough time from Twitter. Now with leading Zeroes.
Using tape archive create a tar file in Stdout (-) and pipe that into a compound command to extract the tar file from Stdin at the destination. This similar to "Copy via tar pipe ...", but copies across file systems boundaries. I prefer to use cp -pr for copying within the same file system.
It can be used to create an index of a backup directory or to find some file.
Here's a version that uses netcat (although I'd much rather use curl!).
specific information about your intel CPUs in your system and their features
This is useful for paging through long directories, mulitple directories, etc. I put this in my ~/.bash_aliases file and alias 'lsl' to it.
The '[r]' is to avoid grep from grepping itself. (interchange 'r' by the appropriate letter)
Here is an example that I use a lot (as root or halt will not work):
while (ps -ef | grep [w]get); do sleep 10; done; sleep 60; halt
I add the 'sleep 60' command just in case something went wrong; so that I have time to cancel.
Very useful if you are going to bed while downloading something and do not want your computer running all night.
Will check if the given module is installed in the @INC. It will print the path and return 0 if found, or 1 otherwise.
Based on script from SharpyWarpy in http://www.linuxquestions.org/questions/linux-general-1/how-to-list-all-installed-perl-modules-216603/
This is a more concise answer to http://blog.commandlinekungfu.com/2011/09/episode-158-old-switcheroo.html in my opinion.
This version uses a bash function and does not print the path to the module.
When downloading files on a Mac, Apple adds the x-attribute: com.apple.quarantine. Often, this makes it so you can't even run a ./configure. This command gets rid of the quarantine for all files in the current directory.
Creates a database that could then be populated with a dump file or application.