prints out the duplicate parts of 2 strings (bash function)

stroverlap.bash

# prints out the duplicate parts of 2 strings
# @param string input1
# @param string input2

function stroverlap()
{
    [ -z "$1" ] && return 1
    [ -z "$2" ] && return 1
    printf "%s\\n" $@ | awk 'x[$0]++'
}