grep '^\~01' nut_data.txt > sr11f01.txt
grep '^\~02' nut_data.txt > sr11f02.txt
grep '^\~03' nut_data.txt > sr11f03.txt
grep '^\~04' nut_data.txt > sr11f04.txt
grep '^\~05' nut_data.txt > sr11f05.txt
grep '^\~06' nut_data.txt > sr11f06.txt
grep '^\~07' nut_data.txt > sr11f07.txt
grep '^\~08' nut_data.txt > sr11f08.txt
grep '^\~09' nut_data.txt > sr11f09.txt
grep '^\~10' nut_data.txt > sr11f10.txt
grep '^\~11' nut_data.txt > sr11f11.txt
grep '^\~12' nut_data.txt > sr11f12.txt
grep '^\~13' nut_data.txt > sr11f13.txt
grep '^\~14' nut_data.txt > sr11f14.txt
grep '^\~15' nut_data.txt > sr11f15.txt
grep '^\~16' nut_data.txt > sr11f16.txt
grep '^\~17' nut_data.txt > sr11f17.txt
grep '^\~18' nut_data.txt > sr11f18.txt
grep '^\~19' nut_data.txt > sr11f19.txt
grep '^\~20' nut_data.txt > sr11f20.txt
grep '^\~21' nut_data.txt > sr11f21.txt
grep '^\~22' nut_data.txt > sr11f22.txt
grep '^\~23' nut_data.txt >> sr11f13.txt