文件操作 - release-upgrade-motd
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文件: /usr/lib/ubuntu-release-upgrader/release-upgrade-motd
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#!/bin/sh -e # # 91-release-upgrade - display upgrade message or update the cache # in the background # # Copyright (C) 2010 Canonical Ltd. # # Authors: Dustin Kirkland <kirkland@canonical.com> # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, version 3 of the License. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. stamp=/var/lib/ubuntu-release-upgrader/release-upgrade-available if [ -f "$stamp" ]; then # Stamp exists, see if it's expired now=$(date +%s) lastrun=$(stat -c %Y "$stamp") 2>/dev/null || lastrun=0 expiration=$(expr $lastrun + 86400) if [ $now -ge $expiration ]; then # Older than 1 day old, so update in the background /usr/lib/ubuntu-release-upgrader/check-new-release -q > "$stamp" & elif [ -s "$stamp" ]; then # Less than 1 day old, and non-empty, so display now cat "$stamp" echo fi elif [ "$(id -u)" = 0 ]; then # No cache at all, so update in the background /usr/lib/ubuntu-release-upgrader/check-new-release -q > "$stamp" & fi
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