
calculate sum and average of lines of number
Assuming a file contains a bunch of numbers, one number per line, like this: 1 2 3 4 5 6 One can easily calculate the sum and average of all these numbers, by using awk: cat numbers  awk ‘{sum += $1; count += 1} END {print “sum:” sum ” avg:” sum/count}’

Copy current git branch into pasteboard (the Clipboard) on Mac OS X
git branchgrep ‘*’tr d ‘* \n’pbcopy