[purple]
auth = no
enabled = 0
username =
password =
priority = 0
host = True

[shovel]
group =
manual = False
enabled = 0
username =

sed '/[shovel]/,/^$/ s/enabled = 0/enabled = 1/' file

sed '/[shovel]/,/^$/ s|enabled = 0|enabled = 1|' file

sed '|[shovel]|, |^$| s|enabled = 0|enabled = 1|' file

perl -000 -n -i -e 's/^enabled = 0$/enabled = 1/m if /^[shovel]n/; print;' config.ini

awk '/shovel/{flag=1}flag&&/enabled/{$NF=1;flag=0}1' input

sed -i '3s/enabled = 0/enabled = 1/g' file