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I used this to get all the remote connection ip addresses connected to my server... I had to start storing and tracking this data so thats why i built this out... probably not optimal as far as the egrep regex but it works ;)
Counts of messages by recipient, with frozen messages excluded.
Inner "ps...grep..." command searches for a process matching the specified .
"lsof -p lists all file descriptors owned by . Includes open files, sockets, devices, etc...
NOTE: When doing these commands when asked for questions there might be flowing text from the pv doing the progress bar just continue typing as if its not there, close your eyes if it helps, there might be a yes or no question, type "yes" and ENTER to it, and also it will ask for a password, just put in your password and ENTER
I talk alot more about this and alot of other variations of this command on my site:
I use this one-liner to search my sourcecode to find out where tags are named and since there's no easy way in XCode to see what values have already been used.
Rename all files in current directory by names from text file 'zzz'
Display all pid less the 300 processes info
set CDIR for it to work right..
This one has a better performance, as it is a one pass count with awk. For this script it might not matter, but for others it is a good optiomization.
top 10 of access log
Opens all files in the index (modified plus not added yet) in tabs in vim.
This solution is similar to  except that it does not have any dependency on GNU Parallel. Also, it tries to minimize the impact on the running system (using ionice and nice).
make usable on OSX with filenames containing spaces. note: will still break if filenames contain newlines... possible, but who does that?!