#!/bin/bash
CellSite='Line 1
Line 2
Line 3
    btsName = "NO74NO038",
Line 5
    btsName = "RV74XC038","
Line 7
    btsName = "no11no000",
'
btsName=$(awk -F\" 'NR==6{print $2; exit}' <<< "$CellSite")
echo "$btsName"