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${ cdr_type},${DAYZ},${14}and${22}instead of$cdr_type,$DAYZ,$14and$22.$14as expanded by the shell would be the same as${1}4and if$1is empty, that would give4as expected. In there, it looks like there are some$s that you want to pass untouched toawkand some for which you want shell variables to be expanded.