9.85.3 Can you answer these questions?

9.85.3.1 Usepackage from a superdirectory

https://tex.stackexchange.com/landing/r/digest?cta=question&id=705517

I have several folders/subdirectories (within a main directory) having a Tex projects (of their own) that require a single style file that is in the main directory. 
Rather than having a copy of the ... 
[packages]
 

asked by Ahmed https://tex.stackexchange.com/landing/r/digest?cta=user&id=311319 Score of 1

9.85.3.2 Parse LaTeX errors

https://tex.stackexchange.com/landing/r/digest?cta=question&id=705485

I would like to extract latex errors in a given log file (in LaTeX). Unfortunately, I have no idea how to extract them reliably, so for now I just take all lines starting with a ! , but is is not very ... 
[error-writing]
 

asked by tobiasBora https://tex.stackexchange.com/landing/r/digest?cta=user&id=116348 Score of 2

9.85.3.3 The indent setting is not consistent

https://tex.stackexchange.com/landing/r/digest?cta=question&id=705571

The paragraphs in Chpaters and Sections have indent. But the first paragraph of the subsection does not have indent. 
In the .cls file, it is set as 
\setlength{\parindent}{0pt} 
And what should I do if ... 
[indentation]
 

asked by Ruihao Wang https://tex.stackexchange.com/landing/r/digest?cta=user&id=311360 Score of 1