#!/bin/bash
read col1 col2 col3 ... coln  <<<
$(mysql -u username -ppassword databasename -sse
    "select col1,col2,col3,...coln from table where ..." 2>/dev/null)

# do something with $col1, $col2...

mysql -u username -ppassword databasename -sse
    "update table set col1=..., col2=... where ..." 2>/dev/null

[mysql]
user=user
password=password