code: def main():
     
     file=""
     if '-h' in sys.argv:
         print(main.__doc__)
         sys.exit()
     elif '-i' in sys.argv:
         file=input("Enter eigenparameters data file name: ")
         
     elif '-f' in sys.argv:
         ind=sys.argv.index('-f')
         file=sys.argv[ind+1]
     if file!="":
         f=open(file,'r')
         data=f.readlines()
         f.close()
     else:
         data=sys.stdin.readlines()
     ofile=""
     if '-F' in sys.argv:
        ind = sys.argv.index('-F')
        ofile= sys.argv[ind+1]
        out = open(ofile, 'w + a')
     file_outstring = ""
     for line in data:
         tau,Vdirs=[],[]
         rec=line.split()
         for k in range(0,9,3):
             tau.append(float(rec[k]))
             Vdirs.append((float(rec[k+1]),float(rec[k+2])))
         srot=pmag.doeigs_s(tau,Vdirs) 
         outstring=""
         for s in srot:outstring+='%10.8f '%(s)
         if ofile=="":
             print(outstring)
         else:
             out.write(outstring+'\n')
docs: NAME
         eigs_s.py
  
     DESCRIPTION
       converts eigenparamters format data to s format
  
     SYNTAX
        eigs_s.py [-h][-i][command line options][<filename]
  
     OPTIONS
        -h prints help message and quits
        -i allows interactive file name entry
        -f FILE, specifies input file name
        -F FILE, specifies output file name
        < filenmae, reads file from standard input (Unix-like operating systems only)
  
     INPUT
        tau_i, dec_i inc_i of eigenvectors 
   
     OUTPUT
        x11,x22,x33,x12,x23,x13