...
There are other ways to generate a manifest file with one to multiple columns, using parallel is one of the easiest ways. Parallel can be installed with mamba in a python env on the supercomputers, while this step can also be performed on your local computer with parallel installed.
This line of code will mix and match the attributes {db1, db2, db3, db4} with all the fasta files in the given directory, then write the outputs line by line into a text file called manifest. Below is an example of the output. The -k flag means the sequence of the output lines should be the same order as the order of the given attributes.
...