If I am using stdout redirection of a shell block to capture some text I am generating, errors need to go to stderr, but it would also be good if they went into the generated output. For example
for i in files*; do
if there_is_an_error; then
echo big long complicated error message goes here >&2
echo big long complicated error message goes here
continue
fi
stuff_producing_text_on_stdout
done > file_i_am_creating
I do not like duplicating code, such as the big long error message echo. So, I could create a temp file or a temp shell var to save the message, but that makes things more complicated than just duplicating the code, and also is just not my style for something transient like this.
What I would like to do is add a parameter to tee, "-2", that copies to stderr in addition to stdout, just like "-" copies to stdout twice. So the code becomes
echo big long complicated error message goes here | tee -2
Simple, eh?
Where's the tee source? I know this would not be POSIX compliant, but it would work for me, and I hate having to rewrite everything from scratch for trivial stuff like this.