export DEBIAN_FRONTEND=noninteractive
（不能 export DEBIAN_FRONTEND= ，应该是 unset DEBIAN_FRONTEND）
执行命令时直接用 "-o Dpkg::Options::='--force-confdef' -o Dpkg::Options::='--force-confold'" 选项
apt-get -o Dpkg::Options::='--force-confdef' -o Dpkg::Options::='--force-confold' --ignore-missing -y install snmpd
脚本中使用选项变量：
# for /bin/bash
apt_option=( -o Dpkg::Options::=--force-confdef -o Dpkg::Options::=--force-confold -y )
apt-get "${apt_option[@]}" install snmpd
# for /bin/sh
set -x
apt_option="-o Dpkg::Options::='--force-confdef' -o Dpkg::Options::='--force-confold' --ignore-missing -y "
eval "sudo apt-get ${apt_option} install snmpd"
注意：不能在/bin/sh 脚本中直接引用${apt_option}变量，否则会当成一个参数，而不是多个参数，只能通过eval 执行，可以 通过 set -x 查看 解析过程
Configuration file '/etc/snmp/snmpd.conf'
==> File on system created by you or by a script.
==> File also in package provided by package maintainer.
==> Keeping old config file as default.
重置环境：
# apt -y purge snmpd
# touch /etc/snmp/snmpd.conf
apt安装历史：
cat /var/log/apt/history.log
cat /var/log/dpkg.log
cat /var/log/apt/term.log
yum、apt-get、zypper安装程序
https://www.trustcomputing.com.cn/bbs/viewthread.php?tid=1106
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本帖最后由 linda 于 2025-5-15 12:18 编辑 ]
