was said earlier:
 1) That "set +e ... set -e" seems -really- bogus.
       That forces exit on non-zero exit status from
       simple commands, and this script intentionally
       invokes some simple commands that might exit
       non-zero, such as the expr line on the very next
       line after the "set +e".
$ help set
"-e  Exit immediately if a command exits with a non-zero status."
"Using + rather than - causes these flags to be turned off."
So as I understand: "set +e" make sure that it will NOT exit
script because of the non-zero expr results. Which seems ok.

-- 
x11-common loop asking 'Please enter an integer between -20 and 19.' at debconf 
medium or higher
https://launchpad.net/bugs/68267

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