Question

Consider ./my_script >/var/log/my_log

Single echo statement from this script alone must to go to stdout.

How could this be accomplished ?

Answer 1

so we have some clever program

cat print2stdout 
#!/bin/sh

echo some words secret and sent to null

echo some words to stdout > /dev/fd/3

last line puts to echo to 3 file descriptor opened.

and when invoking we map 3 FD to stdout, then redirect stdout to file

the result looks like that:

./print2stdout 3>&1 >/dev/null  
some words to stdout