Bash obtiene valor después de igual signo
echo "GenFiltEff=7.092200e-01" | cut -d "=" -f2
Perro Fiel
echo "GenFiltEff=7.092200e-01" | cut -d "=" -f2
your_str='GenFiltEff=7.092200e-01'
echo $your_str | cut -d "=" -f2