7-Zip 命令列下解壓縮特定檔案

在 command line 下解壓縮 .7z 檔案內某一個特定檔案。

先用列出壓縮檔內的檔案清單（以 photos.7z 為例）。

7z list
ghill@ghill:~$ 7z l photos.7z

--
Path = photos.7z
Type = 7z
Physical Size = 2934737
Headers Size = 279
Method = LZMA2:3m
Solid = +
Blocks = 1

   Date      Time    Attr         Size   Compressed  Name
------------------- ----- ------------ ------------  ------------------------
2022-02-21 14:07:35 D....            0            0  photos
2022-02-21 14:07:35 ....A       947811      2934458  photos/1.png
2022-02-21 14:07:35 ....A       883797               photos/2.png
2022-02-21 14:07:35 ....A       718844               photos/3.png
2022-02-21 14:07:35 ....A        39056               photos/cat.png
2022-02-21 14:07:35 ....A        87253               photos/live.png
2022-02-21 14:07:35 ....A        33762               photos/live_120.png
2022-02-21 14:07:35 ....A       123127               photos/live_240.png
2022-02-21 14:07:35 ....A       107068               photos/ss.png
------------------- ----- ------------ ------------  ------------------------
2022-02-21 14:07:35            2940718      2934458  8 files, 1 folders

假設我只想要解壓縮 cat.png 就好，我可以用下列指令解壓縮：

ghill@ghill:~$ 7z e photos.7z -o./ cat.png -r

7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21
p7zip Version 16.02 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,64 bits,2 CPUs Intel(R) Celeron(R) CPU        E3300  @ 2.50GHz (1067A),ASM)

Scanning the drive for archives:
1 file, 2934737 bytes (2866 KiB)

Extracting archive: photos.7z
--
Path = photos.7z
Type = 7z
Physical Size = 2934737
Headers Size = 279
Method = LZMA2:3m
Solid = +
Blocks = 1

Everything is Ok

Files: 4
Size:       2589508
Compressed: 2934737

7z 用到的參數簡介：

l: List contents of archive.
e: Extract files from archive (without using directory names).
-o{Directory}: Set Output directory.
-r: Recurse subdirectories (CAUTION: this flag does not do what you think, avoid using it).

-o 跟後面的路徑要連在一起，不能有空格。