Om Prakash Singhshe’ll

$ ps axu | grep…

$ ps axu | grep [a]pache2

grep processes list avoiding the grep itself

sudo !!

$ curl –silent http://www.census.gov/population/international/ | grep wclocknum | sed -r ‘s#^.*>([0-9,]+)<.*$#\1#'

$ ps aux | grep $(echo $1 | sed “s/^$.$/[\1]/g”)

$ head -c20 /dev/urandom | xxd -ps