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使“apt-get update”显示与“apt update”精确相同的输出

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使“apt-get update”显示与“apt update”精确相同的输出

我正在学习 Advanced Packaging Tool 的 CLI 接口。从其 stdout 不是终端时的输出来看apt(8)，它不适合“需要稳定编程接口的脚本”，所以我正在研究apt-get(8)。

apt update和之间的一个区别apt-get update是后者在所有缓存都更新后缺少最后一行：

8 packages can be upgraded. Run 'apt list --upgradable' to see them.

我想知道如何才能显示这一精确的线条apt-get(8)。

答案1

man apt-get显示：

   -s, --simulate, --just-print, --dry-run, --recon, --no-act
       No action; perform a simulation of events that would occur based on
       the current system state but do not actually change the system.
       Locking will be disabled (Debug::NoLocking) so the system state
       could change while apt-get is running. Simulations can also be
       executed by non-root users which might not have read access to all
       apt configuration distorting the simulation. A notice expressing
       this warning is also shown by default for non-root users
       (APT::Get::Show-User-Simulation-Note). Configuration Item:
       APT::Get::Simulate.

所以如果你这样做：

apt-get upgrade --dry-run

它将输出：

...
4 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade.
...

答案2

猜测您需要处理可用更新的数量，这里有一个建议：

# With no option, returns two numbers, no CR nor LF
/usr/lib/update-notifier/apt-check

# With --human-readable, returns numbers, locale LANG text & CR/LF
/usr/lib/update-notifier/apt-check  --human-readable

不需要 sudo
输出很容易使用

更多的选择：

> /usr/lib/update-notifier/apt-check  --help
Usage: apt-check [options]

Options:
  -h, --help            show this help message and exit
  -p, --package-names   Show the packages that are going to be
                        installed/upgraded
  --human-readable      Show human readable output on stdout
  --security-updates-unattended
                        Return the time in days when security updates are
                        installed unattended (0 means disabled)

答案3

从man 8 apt：

... 启用一些选项...

然后我浏览/usr/share/doc/apt/examples/configure-index.gz（用于zcat(1)显示文本内容）并注意到这个选项：

apt::cmd::show-update-stats

因此我制定出了以下命令来完全实现我的要求：

# apt-get -o apt::cmd::show-update-stats=true update

经过测试，可以在 Xenial 和 Bionic 上运行。

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