# test effect of assigning to readonly vars on loops and non-interactive shells # fatal error when in posix mode var=foo readonly var for num in 1 2 3 4 5; do if [ $num -eq 3 ]; then var=bar fi echo $num done echo after readonly assignment # non-numeric arguments to break are fatal errors for all non-interactive shells for f in 1 2 3 4 5 do break x done echo after loop