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lang-bash
-coption tostat.stat -f %m -t %F "$file". Sorry, I can't test it.statas per your comment, things seem to execute but no output for all test cases. But, what is the"$file" =~ ([0-9]{8}).txt$doing?.txtat the end of the filename. The parentheses()captures the 8 digits part, and you can find it in${BASH_REMATCH[1]}.if [[=~]]you can try the basicif filedate=$(expr "$file" : '.*-\([0-9]*\).txt')and then replace${BASH_REMATCH[1]}by$filedate.