How to remove new line using linux command

Question

I have a file that contains data as follows:

text1, text2, text3,
text4
text5, text6, text7,
text8

I need to bring the text4, text8 to the previous line that ends with a comma. How can I achieve this please ?

EDIT: Please, note that I have thousands of line. I need to automate the process.

Answer 1

Try the following perl command:

$ perl -p -e 's/,\n/, /g' file
text1, text2, text3, text4
text5, text6, text7, text8

Answer 2

> perl -pe 'if(/,\n/){$_=~s/\n//g}' temp
text1, text2, text3,text4
text5, text6, text7,text8

do it inplace :

perl -pi -e 'if(/,\n/){$_=~s/\n//g}' temp

Answer 3

Perl is probably the easiest tool:

perl -wpe 'chomp if /,$/' file

This says: Print all the lines of "file", but leave out the newline if the line ends on a comma.