$ echo "contents of file1">file1
$ echo "contents of file2">file2
$ echo "contents of file3">file3
$ echo "contents of file4">file4
$ tar cf parent.tar file?
$ rm -f file?
$ perl temp.pl
$ tar xfv child1.tar
file1
file2
$ cat file?
contents of file1
contents of file2
$ tar xfv child2.tar
file3
file4
$ cat file?
contents of file1
contents of file2
contents of file3
contents of file4