Bash script global redirection with exec and write to screen -

i have large bash script , want globally redirect stdout/stderr file, except progress indicators such specific echo messages. example, consider following script

#!/bin/bash  # stdout , stderr go out.log exec &> out.log  special_echo "starting"  # many other commands go here # output both stdout , stderr # special_echo commands in here, # example echo "msg1" special_echo "middle" echo "msg2" >&2  special_echo "finished" 

when run output should be

$ ./script starting middle finished $ 

but, out.log should contain

msg1 msg2 

how implement special_echo functionality? i've tried using file descriptor , echoing can't display on screen.

is there way achieve without appending redirection every line or doing in answer?

yes, using file descriptor way go:

#!/bin/bash  exec 3>&1 special_echo () {     echo "$@" >&3 }  exec &> out.log  special_echo "starting" echo "msg1" special_echo "middle" echo "msg2" >&2 special_echo "finished"