In P4 command line I only need to get the Description and Files fields

Using CMD why this does not work ? p4 --field Description="New CL description here" change -o changelist_number | p4 change -i

P4 change -o gives me the list of files and an empty description field. What is the best cmd batch command to change the description ? Considering I don't want to replace < enter the description here > with a string finder.

To change the description of a pending changelist, do:

p4 --field "Description=NEW DESCRIPTION" change -o CHANGE | p4 change -i

Note that you need an up to date p4 client executable (for the --field flag) and that this won't work on a submitted changelist since they're protected from editing.