How to redirect the output of a script to a file and run it in the background?

Question

linux

Trying to combine two commands
bin/prog &
bin/prog 2>&1 >filename.log
The two obvious options don't work
bin/prog 2>&1 >filename.log &
bin/prog & 2>&1 >filename.log

Answer 1

(./bin/prog &> filename.txt ) &

Answer 2

bin/prog 2>&1 >filename.log
Well, this option doesn't work anyway if you wanted to redirect both stdout and stderr to filename.log. In fact, you redirected only stdout to filename.log, and stderr went to the freed stdout.
But if you write it in a working form:
or
then after the union it will work:
or
bin/prog > filename.log 2>&1 &

Answer 3

nohup ./bin/prog > prog.log &