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Is there an alternative to "tee" with "pipeline" to capture outputs and at the same time view on the stdout device? Thanks again for the clear explanation, helped me a lot.

Your comment "all commands except the last are executed in a sub-shell" explains the behavior, which is what I though though was not sure. What exactly is the "last one", the tee command itself, the...

You can use <Command> | tee -a <logfile>. You will be able to see output of <Command> on your stdout and it will also be captured in the file <logfile>. If you use -a with tee it causes the output to...

function GetInput
{
print -n "Input"
read input
export INPUT=$input
}
export COMMAND="GetInput"

$COMMAND
echo "$INPUT"

$COMMAND | tee -a Log.log
echo "$INPUT"

The...