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on executing the script the error meaasge
"${i// /}": The specified substitution is not valid for this command.

Hi all,

using a utility image file was named starting with blank space and a blank space in between. I want to rename the files.

file names are in the format " sb 12.tif"," sb 13.tif"," sb...

try escape characters

try this
cat filename |tr -s "." "\n"