Exact unix script needed to Read a file and than convert it to .csv format

i have a .xls(or any other format) file place in source folder(remote ip say 1.2.3.4/logfiles/srcfiles/). The file has 100 rows. The records are as :

empno ename city deptno
1 abc sydney 001
2 bcd alaska 002
3 def delhi 003

now i want a script which can read this file from that location & than convert it into the .csv file. Plz i need urgent help in this regard.