Thanks for you help. One more quick question
If I were to use that sed command to only edit let's say the second or third (Edit**) delimiter ':'. How would I do that?
The online manual doesn't say too much about that:
Sed Addresses
An address is not required, but if specified must be a number (that
counts input lines cumulatively across input files)
So I tried doing:
sed 2's/:/,/' file1 file2 > tempit.ca
That means the second line. However, I need the second field.