Remove the comment symbol ' from a file.

I want to remove the commented lines in a file identified by ' symbol at the start of each ine. A sample example will be like:

Input
-----
'IFerr_flag=0THEN
iferr_flag=0then
iferr_flag=0then
iferr_flag=0then
iferr_flag=0then
iferr_flag=0then
iferr_flag=0then

Output
-------
iferr_flag=0then
iferr_flag=0then
iferr_flag=0then
iferr_flag=0then
iferr_flag=0then
iferr_flag=0then

sed "/^ *'/d" filename >tmp ; mv tmp filename

tyler_durden

grep -v "^'" filename

Thanks so much ....