Run a command trusting that it will succeed, squelching
stderr. If errors do occur, i.e. the command exists with a non-zero
exit code, the full
stderr output will be printed after
that error has occurred.
trusting requires Python 3.5 or greater.
trusting is somewhere in your
$ trusting pdflatex doc.tex
pdflatex doc.tex without all that verbose output you don't
want to see.
stdin is set to
/dev/null, user input for the running
commands are not supported.