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Full Discussion: Get original file size of zipped file
Top Forums Shell Programming and Scripting Get original file size of zipped file Post 302592590 by Corona688 on Tuesday 24th of January 2012 10:46:02 AM
Old 01-24-2012
Are you sure, Jim?

Code:
$ cat vectortop.png | gzip > vectortop.png.gz
$ gunzip -l vectortop.png.gz
         compressed        uncompressed  ratio uncompressed_name
               4360                4337  -0.1% vectortop.png
$

The 'cat' is to make sure it's not doing anything sneaky like running fstat on /dev/stdin.

---------- Post updated at 09:46 AM ---------- Previous update was at 09:14 AM ----------

yet again, working on streams:

Code:
$ gunzip -l < vectortop.png.gz
         compressed        uncompressed  ratio uncompressed_name
               4360                4337  -0.1% stdout

The limit seems to be that the compressed file has to be a file, not a stream, for the final size to be known. Maybe it has to seek to the end, impossible in a stream.

Code:
$ cat vectortop.png.gz | gunzip -l 
         compressed        uncompressed  ratio uncompressed_name
                 -1                  -1   0.0% stdout
$

 

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LEARN ABOUT OSX

zipsplit

zipnote(1)						      General Commands Manual							zipnote(1)

NAME

       zipsplit - split a zipfile into smaller zipfiles

SYNOPSIS

       zipsplit [-t] [-i] [-p] [-s] [-n size] [-r room] [-b path] [-h] [-v] [-L] zipfile

ARGUMENTS

       zipfile	Zipfile to split.

OPTIONS

       -t     Report how many files it will take, but don't make them.

       -i     Make index (zipsplit.idx) and count its size against first zip file.

       -n size
	      Make zip files no larger than "size" (default = 36000).

       -r room
	      Leave room for "room" bytes on the first disk (default = 0).

       -b path
	      Use path for the output zip files.

       -p     Pause between output zip files.

       -s     Do a sequential split even if it takes more zip files.

       -h     Show a short help.

       -v     Show version information.

       -L     Show software license.

DESCRIPTION

       zipsplit reads a zipfile and splits it into smaller zipfiles.

EXAMPLES

       To be filled in.

BUGS

       Does not yet support large (> 2 GB) or split archives.

SEE ALSO

       zip(1), unzip(1)

AUTHOR

       Info-ZIP

								v3.0 of 8 May 2008							zipnote(1)
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