Remove spaces from columns

Shell Programming and Scripting
1

I have a file with only one field something like this :
213.45

220.65

240.47

345.67

320.45

I want to remove all spaces in between. Is there any unix command for that ?Thanks in advance..

2

If you mean blank lines:

grep . filename

or without external commands:

printf "%s\n" $(<filename)
3

Thanks a lot, radoulov !!

grep . filename worked nicely..