regex - To remove lines from a csv which have only commas -

i have file has lines have commas, , no data. issue lines not have fixed number of commas. data may below-

99,abc,123,, bcd,123,th ,,bcd,123,th ,,,,bcd,123,th ,,, ,,,,,

the output should like

99,abc,123,, bcd,123,th ,,bcd,123,th ,,,,bcd,123,th

i have remove lines have commas.

try single grep follows.(negating lines have started comma , till end have comma, in commands same logic used)

grep -v '^,*$'  input_file

try awk solution follows.

awk '!/^,*$/'  input_file

try sed solution on same.

sed -n '/^,*$/d;p'  input_file

Single