I've got a text file with an arbitrary number of lines, e.g.:

one line
some other line
an additional line
one more here

I'd like to write a script to reorder those lines based on a given order. e.g.

• An input of 2 1 3 4 would swap the first and second lines.
• An input of 3 1 2 4 would put the 3rd line first, the 1st line second, the 2nd line third and keep the 4th line fourth.

I could hack something together, but I'm wondering if there's an elegant solution?

I can use either bash or ksh.