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This was tested on Ubuntu 12.04 (Precise) LTS Server. It returns the name of the symlink within /dev/disk/by-id for the physical drive you specify. Change /dev/sda to the one you want, and replace ata- with scsi- or the appropriate type for your drive.
I used this to pre-configure grub-pc during a non-interactive install because I had to tell it which disk to install grub on, and physical disks don't have a UUID such as that blkid provides.
Not always does Xorg run on :0. For times like those, this script allows you to find out which it is.
find files recursively from the current directory, and list the extensions of files uniquely
looks at html for "ip" (it's a CSS class), then a little of cut and egrep to get IPv4 address.
I use this oneliner into conky.
Use meaningful exit codes
change "source" to "cat" to view output instead of assigning
Get link to external sites of a url
Depending on your Apache access log configuration you may have to change the sum+=$11 to previous or next awk token.
Beware, usually in access log last token is time of response in microseconds, penultimate token is size of response in bytes. You may use this command line to calculate sum and average of responses sizes.
You can also refine the egrep regexp to match specific HTTP requests.
Get a list of all the unique hostnames from the apache configuration files. Handy to see what sites are running on a server. When i saw the command i had some ideas to make it shorter. Here is my version.
Simple TCPDUMP grepping for common unsafe protocols (HTTP, POP3, SMTP, FTP)
First get a api key for google url shortner from here https://developers.google.com/url-shortener/
Then replace the API_KEY in the command
Very useful for finding all the source code that should be compiled.
Returns last day of current month. Useful to implement a bash script backup based on a GFS strategy.
Search for java explicit incrementation in order to replace it with postfix or assignment operator
find -printf "%f\n" prints just the file name from the given path. This means directory paths which contain extensions will not be considered.
adjusting the field "f1" will give you additional information such as
f1 = 98%
f2 = discharging
f3 = 2:02 remaining
speaks out last twitter update using 'say'
The other 2 commands that are listed will also kill the egrep process and any libexec processes because the .exe isn't escaped so it is really using . meaning anything containing exe. The command i posted escapes the (dot) in .exe and then filters the actual egrep process so that it doesn't get killed before the other processes being killed. Also added the -9 switch for kill to send sigterm to the processes, in case people are wondering why processes aren't getting killed after running just kill . This should work better for people :)