rpm、yum、编译安装轻松管理centos7程序包（9）

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8、查询某包安装或卸载时执行脚本；

            rpm -q --scripts PACKAGE_NAME

# rpm -q --scripts zsh
\postinstall scriptlet (using /bin/sh):
if [ "$1" = 1 ]; then
  if [ ! -f /etc/shells ] ; then
    echo "/usr/bin/zsh" > /etc/shells
    echo "/bin/zsh" >> /etc/shells
  else
    grep -q "^/usr/bin/zsh$" /etc/shells || echo "/usr/bin/zsh" >> /etc/shells
    grep -q "^/bin/zsh$" /etc/shells || echo "/bin/zsh" >> /etc/shells
  fi
fi

if [ -f /usr/share/info/zsh.info.gz ]; then
# This is needed so that --excludedocs works.
/sbin/install-info /usr/share/info/zsh.info.gz /usr/share/info/dir \
  --entry="* zsh: (zsh).            An enhanced bourne shell."
fi
preuninstall scriptlet (using /bin/sh):
if [ "$1" = 0 ] ; then
    if [ -f /usr/share/info/zsh.info.gz ]; then
    # This is needed so that --excludedocs works.
    /sbin/install-info --delete /usr/share/info/zsh.info.gz /usr/share/info/dir \
      --entry="* zsh: (zsh).            An enhanced bourne shell."
    fi
fi
postuninstall scriptlet (using /bin/sh):
if [ "$1" = 0 ] && [ -f /etc/shells ] ; then
  sed -i '\!^/usr/bin/zsh$!d' /etc/shells
  sed -i '\!^/bin/zsh$!d' /etc/shells
fi

        脚本有四类：

            preinstall：安装过程开始之前执行的脚本；

            postinstall：安装过程后执行的脚本；

            preuninstall：卸载前执行的脚本；

            postuninstall：卸载过程完成之后执行的脚本；