2020-01-01 12:13:14 8
2020-01-01 12:13:14 7
2020-01-01 12:13:14 8
2020-01-01 12:13:14 9
cat file | awk -F' ' '{split($1, date, "-"); print date[1] "-" date[2] "\t" $3}'
2020-01-01 12:13:14 8
2020-01-01 12:13:14 7
2020-01-01 12:13:14 8
2020-01-01 12:13:14 9
cat file | awk -F' ' '{split($1, date, "-"); print date[1] "-" date[2] "\t" $3}'