That line comes from a CSV producer. Is it possible to ask (them) to add a field that *only* has the source file?

• What if the file name becomes a URI?
• What if the file name will contain spaces?
• What if the comment changes?
• What if the file name will contain special characters like " or ,, that are totally valid in file names?
• What if the file name is case(in)sensitive?
• What if the path becomes relative or starts with a drive letter?

Assuming the line comes out the file named export.csv, you could try an overly safe approach like this:

$ cat export.csv
3,"2014-02-19 14:29:05","Extracted 1 Unfulfilled Reconciliation record
+s into /opt/mysql/backup/recon/201312/input/UNFULFILLED_RECONCILIATIO
+N_20130225.CSV","URECONCILIATION"
$ perl -MText::CSV_XS=csv -wE'for(@{csv(in=>"export.csv")}){say for ma
+p{s/.* into //i;$_}grep/\.csv/i=>@$_}'
/opt/mysql/backup/recon/201312/input/UNFULFILLED_RECONCILIATION_201302
+25.CSV
$
[download]

Requires Text::CSV_XS-1.04, but it is a one-liner now.