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Old 08-18-2016, 12:20 PM   #1
Registered: Feb 2003
Location: Orangeville
Distribution: Fedora
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Question Linux commands to deal with a compressed bitstream

I have a file which I'm told is a compressed bitstream.

Any commands like lz4cat to deal with it? I want to decode it and things like unzip won't work because of the bitstream component.
Old 08-18-2016, 02:51 PM   #2
Registered: Aug 2007
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Unless you know which compression format is being used you won't know which command to use.

Who told you it is a compressed bitstream and is there more information on the subject ?

Does the `file` command tell you anything about the compression used ?

Also it is very unlikely that unzip would be used as zip is a compression utility itself. You wouldn't compress the output of zip again. It is likely a tar or cpio archive that is then output to standard output and compressed through a pipe.

This approach is often used to create an initramfs as follows.

find . | cpio --quiet -c -o | gzip -9 -n > ../initramfs64-catalyst

To extract the above you would do the following

zcat initramfs64-catalyst | cpio -id


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