Thanks for your help vgersh99

But it is not working
I will explain my problem with an example

Here is the input file
$cat input.dat
|a|b
c|d|
|e|f|i|
|h|i|j|

and out put should be like this
$cat output.dat
|a|bc|d|
|e|f|i|
|h|i|j|

Here the first two lines have been joined since new line is not in between |

Thanks in advance
Shihab