The script was correctly opening the `truth` file by piping `echo` to
it, but then it tried to deny another operation on it. But since pipes
are opened by the script process, the permission was given to the
script. And since the permissions are preserved for the entire runtime
of a process, and child processes inherit permissions of their parents,
any command executed later would also have the necessary permissions to
open `truth` (which was the case for the second operation). Now the
second operation is performed on a different file.
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