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If you have those filenames in a file a simple grep can do what you want. For example:
$ cat f.txt
a
b
d
e
$ ls -1 folder
a
b
c
d
$ grep -v "^$(ls -1 folder)$" f.txt
e
$
File c is not...

It is easy to see what files are there. You then need to walk through the list and see which file wasn't found.

echo `ls . | egrep "listener.ora|sqlnet.ora|tnsnames.ora|missingfile.txt"`


...

If you want to use file as external table then below one is also can be good option :

i=1; while [ $i -lt 10 ]; do echo "$i , $i name ,$i address , $i sales , "; ((i=$i+1)) done >> E_your_table
...