如何显示已安装硬盘的大小

目前尚不清楚您的问题是什么。我希望您不希望有人编写整个脚本，而是询问如何获得要使用的数字。

使用 lshw，这是我系统的（编辑）输出，存在一个 NVMe 和一个 SSD

$ lshw -c disk
  *-namespace               
       description: NVMe namespace
       logical name: /dev/nvme0n1
       size: 953GiB (1024GB)
...
  *-disk
       description: ATA Disk
       product: Samsung SSD 850
       logical name: /dev/sda
       size: 931GiB (1TB)
...

它需要 sudo 才能使用，但它可以工作：

sudo lshw | grep -Pzo "\*-(disk|namespace)(\n.*)+?\s+size:.*?\(\K\d+\w+" | tr "\0" "\n" | paste -sd/

它给出这样的输出：

1TB/750GB

否则你不会知道它是否是 TB/GB/MB，所以这就是我保留这些的原因。

编辑：我注意到.*不需要正则表达式中的 an 。上面的命令已更新。

解释：

sudo lshw: 嗯...列出硬件。我们需要 sudo 来查看系统中的驱动器。这将是我们的信息来源。

grep -Pzo：我们将使用正则表达式来获取所需的信息

-P = activate perl regex
-z = treat everything as one long line; this is required because we're going to use regex over multiple lines
-o = instead of showing the output and marking the result red, just show the result

regex（提示：去掉-o（又名-Pz）并在下面一一添加正则表达式，看看会发生什么一步一步；红色文本是正则表达式匹配的内容，所以你可以一步一步看到我们是如何接近的到所需的结果以及每一步对输出的更改）：

\*-(disk|namespace) = Find all text that is "*-disk" or "*-namespace". We need to escape (= \) the "*" because in regex it means zero or more, but we don't want that, we want to search for a literal "*".
(\n.*)+ = Keep adding (the "+" = one or more) lines ("\n" = go to the next line; ".*" = everything on that line) to the matched text; you'll see that now everything under the first match of "\*-(disk|namespace)" is red.
?\s+size: = we keep adding lines until we come across the first ("?" = non-greedy a.k.a. the first match instead of the last match) match of one or more whitespaces (= "\s+"; "\s" is whitespace (tab, space, etc.); "+" is one or more) and then "size:"; you'll see that were coming closer to the desired number in the output.
.* = match the rest of that line,
?\( = until the first match (= ?) of a "(", which we need to escape because it is used in regex (you can see it being used in the first part of the regex here).
\K\d+\w+ = match a number (= \d) one or more times (= "+") and after that a word character (= \w) one or more times (= "+"). We now have the desired text in the match, but we don't want all the matched text before that in the output, so we put a "\K" before the desired text to remove the matched text before the "\K" from the output. It is still required to match, it just isn't included in the output. This makes all the regex before it a positive lookbehind (look it up; "positive lookbehind perl regex") with regex capabilities.

tr "\0" "\n"：您会看到我们匹配了所需的文本，仅此而已。当我们再次添加 -o 时，您会看到结果以一种奇怪的方式显示（一个接一个）。那是因为它们用你看不到的空字符 (= \0) 分隔，而不是换行符。这是 grep 的“-z”选项的产物。为了在普通列表中显示它们，将使用换行符替换空字符tr。

paste -sd/: 现在我们将结果放在一个列表中，我们可以使用粘贴命令将它们放在一起，使用“/”作为分隔符。

下面的一行命令应该做你想做的事。

for i in $(lsblk -bdno name,size|tr -s ' ' '_'); do j=${i##*_};j=$(((j+500000000)/1000000000));printf "${i%_*}\t$j\tGB\n";done

您可以~/.bashrc在别名附近的文件中放置一个函数，以便使用短命令运行它，例如mydrives

function mydrives { for i in $(lsblk -bdno name,size|tr -s ' ' '_'); do j=${i##*_};j=$(((j+500000000)/1000000000));printf "${i%_*}\t$j\tGB\n";done }

它对我来说就像这样，之后

source ~/.bashrc

在您修改~/.bashrc文件后打开的所有终端窗口中。

在我的电脑上打印是这样的

$ mydrives
sda     256     GB
sdb     4001    GB
sr0     1       GB
nvme0n1 250     GB

我习惯了 GiB (gibibytes) 所以我经常使用普通lsblk命令

lsblk

或者当我想要更多细节并且有一个宽终端窗口时

lsblk -fm

或其他

lsblk -m

与我为您建议的命令相匹配，但使用 mibibytes、gibibytes、tibibytes（以 2 为基数而不是以 10 为基数）将是

$ lsblk -dno name,size
sda     238,5G
sdb       3,7T
sr0      1024M
nvme0n1 232,9G