Linux (Un/De) 在 bash 中压缩一个字符串？
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(Un/De)compress a string in bash?
提问by Jane Watson
Is it possible to compress/decompress a string in bash using stdin/stdout ?
是否可以使用 stdin/stdout 在 bash 中压缩/解压缩字符串？
I tried this but apparently it is not supported ?
我试过了，但显然它不受支持？
hey=$(echo "hello world" | gzip -cf)
echo $hey # returns a compressed string
echo $hey | gzip -cfd
gzip: stdin is a multi-part gzip file -- not supported
I'm not well versed in linux but I read other compression utilities man pages and couldn't find a solution?
我不精通 linux，但我阅读了其他压缩实用程序手册页，但找不到解决方案？
采纳答案by Micha? ?rajer
When you do:
当你这样做时：
hey=$(echo "hello world" | gzip -cf)
You don't have same same bytes in variable heyas you have in /tmp/myfilecreated by:
您在变量hey中没有与在/tmp/myfile创建时相同的字节：
echo "hello world" | gzip -cf > /tmp/myfile
You get "gzip: stdin is a multi-part gzip file -- not supported" error simply because you have broken compressed data which cannot be uncompressed.
您收到“gzip: stdin is a multi-part gzip file -- not supported”错误，仅仅是因为您破坏了无法解压缩的压缩数据。
The VAR=$(...)construction is designed for working with text. This is why you get extra trailing trim for example.
该VAR=$(...)结构是为处理文本而设计的。例如，这就是为什么您会获得额外的尾随修剪。
回答by Micha? ?rajer
If 33% compression rate loss is acceptable for you, then you can store base64 encoded compressed data:
如果您可以接受 33% 的压缩率损失，那么您可以存储 base64 编码的压缩数据：
me$mybox$ FOO=$(echo "Hello world" | gzip | base64) # compressed, base64 encoded data
me$mybox$ echo $FOO | base64 -d | gunzip # use base64 decoded, uncompressed data
Hello world
It will work, but each 3 (compressed) bytes will be stored in 4 bytes of text.
它会工作，但每 3 个（压缩）字节将存储在 4 个字节的文本中。
