<SOLVED>os.system needs a string in quotes

[wavic]

bash escapes this characters when you hit tab on auto-complete:

 !"$&'()*,:;<=>?@[\]^`{|} # plus lisht space

Here is what you get with echo:

Output:
$ echo (
bash: syntax error near unexpected token `newline'

And with escaping the '(':

Output:
$ echo \(
(

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Why you don't use os.path.join() instead of  pwd+"/"+filename