False positives on COM.FLOW.FilePath erros

### Expected behavior
We don't expect a COM.FLOW.FilePath error when :
- using basename to get the name of a script/file
- setting the variable PATH
- redirecting the stderr of a command in /dev/null
- using the result of a command (id or echo) to set a variable
- using a sql request
- using a loop on a file (done < $filein)

### Actual behavior
For the following parts of script, a COM.FLOW.FilePath error is raised :

Below the iCode results :

### Steps to reproduce behavior

### Detection version
3.0