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The pipe not use "tee" to print on the screen for specific function

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# 1  
Old 04-17-2013
The pipe not use "tee" to print on the screen for specific function
I have code fragment like
Code:
        {
    aa
    bb
    cc
        } > $LOG

aa bb cc, all call function "ff", I want "ff" to print on the screen,but others do not print on the scree, is there a method? I can't use "tee", becasue tee I meet the write "error"
Code:
ff()
{
    echo "hello"
}

# 2  
Old 04-17-2013
Code:
ff()
{
    echo "hello" > /dev/tty
}

# 3  
Old 04-17-2013
Traditionally, those sort of messages go to standard error, file descriptor 2.

Code:
echo "hello" >&2

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