我有这三个文件:
文件.txt.7z = 5.4GB
文件1.txt.7z = 251M
文件2.txt.7z = 7.7M
它们是目录中唯一的文件:
$ tree
.
├── file.txt.7z
├── file-1.txt.7z
└── file-2.txt.7z
我想要
- 解压缩文件
- 将它们合并到一个文件中
- 将合并后的文件拆分为 500,000 行的文件
- 结果有许多带有“.txt”扩展名的文件
现在我是这样实现的:
p7zip -d "*.txt.7z"
cat file-1.txt >> file.txt
rm file-1.txt
cat file-2.txt >> file.txt
rm file-2.txt
split -l 500000 file.txt
for f in *; do mv "$f" "$f.txt"; done
我怎样才能以更优雅的方式实现这一目标?
答案1
7za
+split
解决方案(单管道):
7za e "*.7z" -so 2> /dev/null | split -l500000 --additional-suffix=".txt" --numeric-suffixes=1 - "file"
--7za
选项:
e
- 提取/解压缩档案-so
- 将内容写入STDOUT
--split
选项:
--additional-suffix=".txt"
- 将后缀附加.txt
到所有生成的文件名--numeric-suffixes=1
- 使用从以下位置开始的数字后缀1
-
(连字符)- 从 STDIN(标准输入)读取数据"file"
- 所有结果文件名的公共前缀
上述命令将生成具有以下命名格式的文件:file01.txt
等file02.txt
。
答案2
您可以使用管道和解压后--filter
的选项split
:
p7zip -d *.txt.7z
cat file.txt file-1.txt file-2.txt | split -l 500000 --filter='> $FILE.txt'
rm file*
这是以下的文档--filter option
:
‘--filter=COMMAND’
With this option, rather than simply writing to each output file,
write through a pipe to the specified shell COMMAND for each output
file. COMMAND should use the $FILE environment variable, which is
set to a different output file name for each invocation of the
command. For example, imagine that you have a 1TiB compressed file
that, if uncompressed, would be too large to reside on disk, yet
you must split it into individually-compressed pieces of a more
manageable size. To do that, you might run this command:
xz -dc BIG.xz | split -b200G --filter='xz > $FILE.xz' - big-
Assuming a 10:1 compression ratio, that would create about fifty
20GiB files with names ‘big-aa.xz’, ‘big-ab.xz’, ‘big-ac.xz’, etc.
如果您需要保留包含所有输出的文件,可以使用tee
,它将标准输入复制到标准输出以及作为参数给出的文件。
cat file.txt file-1.txt file-2.txt |
tee all.txt |
split -l 50000 --filter='> $FILE.txt'