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Back to previous simple solution, yes there was a glitch. Sorry about that. wc prints the file name, which I forgot. Here is correct version. Try this, see if it works:

while sleep 10; do
grep...

sed -n 's|.*<port> *\(.*[^ ]\) *</port>.*|\1|p' ../cfg.xmNarrative: If you find a line with '<PORT>', optional spaces, some not-space-value, optional spaces and '</port>', turn the entire line into...

Here is how you assign output to a variable.
var=$(sed -n 's|<port>\(.*\)</port>|\1|p' ../cfg.xml)

If you post the input and how you like the output would be, it would be more easy to give you a...