Redirect stderr to console and file

Question

How can i redirect sdterr of bash script to console and file? I am using:

exec 2>> myfile

to log It to myfile. How to extend it to log to console as well?

Answer 1

You can create a fifo

$ mknod mypipe p

let tee read from the fifo. It writes to stdout and the file you specified

$ tee myfile <mypipe &
[1] 17121

now run the command and pipe stderr to the fifo

$ ls kkk 2>mypipe 
ls: cannot access kkk: No such file or directory
[1]+  Done                    tee myfile < mypipe