文件操作 - 91-release-upgrade
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文件: /etc/update-motd.d/91-release-upgrade
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#!/bin/sh # if the current release is under development there won't be a new one [ -r /etc/lsb-release ] && . /etc/lsb-release if [ -z "$DISTRIB_DESCRIPTION" ] && command -v lsb_release > /dev/null; then DISTRIB_DESCRIPTION=$(lsb_release -s -d) fi if [ "$(echo "$DISTRIB_DESCRIPTION" | cut -d' ' -f4)" = "(development" ]; then exit 0 fi # if it is non-root user, skip if [ $(id -u) -ne 0 ]; then exit 0 fi if [ -x /usr/lib/ubuntu-release-upgrader/release-upgrade-motd ]; then exec /usr/lib/ubuntu-release-upgrader/release-upgrade-motd fi
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