# sage and nohup

Does anyone understand why the code below, saved in the file input.txt, does not work when it is run with the command

nohup sage < input.txt > output.txt &

(Of course, I use * for the product but it does not appear properly here)?

```
import sage.combinat.lyndon_word as LW
from sage.combinat.words.shuffle_product import ShuffleProduct_w1w2 as SP
from sage.combinat.free_module import CombinatorialFreeModule as CFM
F=CFM(QQ, ['a','b'])
R.<a,b>=FreeAlgebra(QQ,2)
Module=CombinatorialFreeModule(F.base_ring(),R)
def TP_free_algebra(w1,w2):
if type(w1)==Integer:
if type(w2)==Integer:
return w1*w2*tensor((Module.basis()[1],Module.basis()[1]))
else:
L2=list(w2)
result=0
for i in L2:
result+=w1*i[0]*tensor((Module.basis()[1],Module.basis()[i[1]]))
return result
else:
if type(w2)==Integer:
L1=list(w1)
result=0
for i in L1:
result+=w2*i[0]*tensor((Module.basis()[i[1]],Module.basis()[1]))
return result
else:
L1=list(w1)
L2=list(w2)
result=0
for i in L1:
for j in L2:
result+=i[0]*j[0]*tensor((Module.basis()[i[1]],Module.basis()[j[1]]))
return result
TP_free_algebra(Word('a'),Word('b'))
```

Concerning `*`: Why don't you use the editor to format code like code?