可以直接把两个.gz文件cat在一起吗？

最爱在深秋

如题！
我有两个比较大的gz文件， 之前我一直都是先解压，再cat，最后gzip，但是这两个文件比较大，如此操作费时，请问能直接把gz文件cat在一起吗？

seeLnd

你不如把两个gz文件tar 起来（不要加压缩的选项），和你说的cat应该是同样效果

rdcwayx

1. gzcat file1.gz file2.gz |gzip > new.gz

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waker

manpage 里专门有一段描述这事儿的

1. 
   
2. ADVANCED USAGE
   
3. 
   
4.        Multiple  compressed  files  can  be concatenated. In this case, gunzip
   
5.        will extract all members at once. For example:
   
6. 
   
7.              gzip -c file1  > foo.gz
   
8.              gzip -c file2 >> foo.gz
   
9. 
   
10.        Then
    
11. 
    
12.              gunzip -c foo
    
13. 
    
14.        is equivalent to
    
15. 
    
16.              cat file1 file2
    
17. 
    
18.        In case of damage to one member of a .gz file, other members can  still
    
19.        be  recovered  (if the damaged member is removed). However, you can get
    
20.        better compression by compressing all members at once:
    
21. 
    
22.              cat file1 file2 | gzip > foo.gz
    
23. 
    
24.        compresses better than
    
25. 
    
26.              gzip -c file1 file2 > foo.gz
    
27. 
    
28.        If you want to recompress concatenated files to get better compression,
    
29.        do:
    
30. 
    
31.              gzip -cd old.gz | gzip > new.gz
    
32. 
    
33.        If a compressed file consists of several members, the uncompressed size
    
34.        and CRC reported by the --list option applies to the last member  only.
    
35.        If you need the uncompressed size for all members, you can use:
    
36. 
    
37.              gzip -cd file.gz | wc -c
    
38. 
    
39.        If  you  wish  to create a single archive file with multiple members so
    
40.        that members can later be extracted independently, use an archiver such
    
41.        as  tar or zip. GNU tar supports the -z option to invoke gzip transpar-
    
42.        ently. gzip is designed as a complement to tar, not as a replacement.
    
43. 
    
44. 
    

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