"" -> "" [OK]
"" -> "" [OK]
"\t \011" -> "\t \011" [OK]
"a" -> "a" [OK]
"b" -> "b" [OK]
"c.txt@!" -> "c.txt@!" [OK]
"\"" -> "\"" [OK]
" " -> " " [OK]
" a " -> " a " [OK]
"  \" \\\" " -> "  \" \\\" " [OK]
" \\ \\ \\\\\\" -> " \\ \\ \\\\\\" [OK]
" \"hola \"" -> " \"hola \"" [OK]
"a\tb" -> "a\tb" [OK]
-- execv

a
b
c.txt@!
"
 
 a 
  " \" 
 \ \ \\\
 "hola "
a	b