On Sunday 01 July 2018 18:10:12 Mike Bird wrote:
> On Sun July 1 2018 17:54:14 Mike Bird wrote:
> > > chmod -R 770 /home/~/.trinity | chown -R ~/home/~/.trinity | chgrp -R
> > > ~ /home/~/.trinity
> > > and/or
> > > chmod -R 770 /home/~/.trinity/* | chown -R ~/home/~/.trinity/* | chgrp
> > > -R ~ /home/~/.trinity/*
> >
> > **** DO NOT DO THIS ^^^ ****
> >
> > This would wreck many permissions that should not be 770.
>
> I wanted to get that warning out quickly.  Now I have time for some
> explanation.
>
> (1) My good ~/.trinity has precisely 0 files with 770 permission.  Don't
>     wreck yours.  Another suggestion was made for 700 permission.  Well
>     my ~/.trinity does have 951 files with 700 permission but they're
>     still the minority.  For example I have 2049 files with 600 permission.
>
>     DON'T MASS-BORK YOUR PERMISSIONS.  UNLESS YOU CAN RESTORE FROM A
>     BACKUP, RECOVERY COULD TAKE DAYS OF WORK.
>
> (2) Commands such as those above should not be linked by pipe "|".  They
>     should be linked by semicolon ";" or in some cases ampersand "&".
>
>     When commands are linked by pipe the output of one is fed as the
>     input to the next.  Even if the next ignores the unwanted input
>     this can still cause problems.  Consider "ls | ls".  If the second
>     ls finishes before the first the pipe breaks and the first ls is
>     prematurely terminated.  If that first ls was instead a command
>     changing every file in your ~/.trinity it would be killed at an
>     arbitrary point in the proceedings instead of completing its job.
>
> So what should you do instead of borking your ~/.trinity?
>
>   find ~/.trinity -not -user U -o -not -group G -exec ls -dl {} \;
>
> Replace U with your user and G with your group in the above.
>
> If the resulting files look like they should belong to you then you
> can:
>
>   chown -R U:G ~/.trinity
>
> --Mike
>

I have not had those problems, but thanks for clarifying my own question: how 
to change the permissions of files inside a folder to 600 only (rw for user), 
but 700 for the folder (because rwx is necessary to enter the folder). 

Bill