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The following code to clear the dmesg buffer exits on error and will not print out the message it was unable to clear the dmesg ring buffer:

        set -o errexit

        set -o verbose

        ulimit -a

        # Clear the dmesg ring buffer. The "post" phase will check dmesg for OOM messages.

        ${set_sudo}

        $sudo dmesg -c > /dev/null 2>&1

        if [ $? -eq 0 ]; then

          echo "Cleared the dmesg ring buffer"

        else

          echo "Could not clear the dmesg ring buffer"

fi

Remove the set -o errexit & set -o verbose lines (verbosity is not required).