How to find out, if the data from STDIN comes from a pipe or from the keyboard?
My script is called in two modes:
echo "[TEXT]" | smtp_send.pl ...
or
smtp_send.pl -message "[TEXT]"
Inside the script, I read with:
while( $zeile = <> ) {
....
}
I need to check, if data comes from a pipe before enter the loop ...
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