#!/bin/bash
s='123;rr;2;RRyO, chess mobil;pio;25.766;1;0;24353;21.876;;S
1243;rho;9;RpO, chess yext cat;downpio;67.98;1;0;237753;25.346;;S
1243;rho;9;RpO, chess yext cat;pio;73;1;0;237753;25.346;;S'
sed 's/^\(\([^;]*;\)\{5\}[0-9]*\)[^;]*/\1/' <<< "$s"
IyEvYmluL2Jhc2gKcz0nMTIzO3JyOzI7UlJ5TywgY2hlc3MgbW9iaWw7cGlvOzI1Ljc2NjsxOzA7MjQzNTM7MjEuODc2OztTCjEyNDM7cmhvOzk7UnBPLCBjaGVzcyB5ZXh0IGNhdDtkb3ducGlvOzY3Ljk4OzE7MDsyMzc3NTM7MjUuMzQ2OztTCjEyNDM7cmhvOzk7UnBPLCBjaGVzcyB5ZXh0IGNhdDtwaW87NzM7MTswOzIzNzc1MzsyNS4zNDY7O1MnCnNlZCAncy9eXChcKFteO10qO1wpXHs1XH1bMC05XSpcKVteO10qL1wxLycgPDw8ICIkcyI=