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Capability to read a compressed file
Posted: Thu Apr 05, 2007 2:50 pm
by vnspn
Hi,
Does DataStage have the capability to read a compressed file?
If I received a file that is compressed from another application or a Mainframe system, can DataStage read that file?
Thanks.
Posted: Thu Apr 05, 2007 2:58 pm
by chulett
No. At least not directly. You'll need to 'uncompress' it first and that's a job for your O/S. Or your file transfer mechanism.
Posted: Thu Apr 05, 2007 7:26 pm
by ray.wurlod
You can specify unzip, gunzip, etc., as the filter command in a Sequential File stage. Then DataStage reads from the output of the command via a pipe.
Posted: Thu Apr 05, 2007 9:50 pm
by chulett
Which would be the 'O/S' that I mentioned.
And it will take more than a simple 'unzip' command in the Filter. That might get you the file names being unzipped but not their content. Make sure your unzipper / decompressor has an option to write the uncompressed output to
standard out. For example:
Not sure what the equivalent would be on the Windows command line.
Posted: Thu Apr 05, 2007 10:17 pm
by ray.wurlod
Code: Select all
UnZip 5.50 of 17 February 2002, by Info-ZIP. Maintained by C. Spieler. Send
bug reports to the authors at Zip-Bugs@lists.wku.edu; see README for details.
Usage: unzip [-Z] [-opts[modifiers]] file[.zip] [list] [-x xlist] [-d exdir]
Default action is to extract files in list, except those in xlist, to exdir;
file[.zip] may be a wildcard. -Z => ZipInfo mode ("unzip -Z" for usage).
-p extract files to pipe, no messages -l list files (short format)
-f freshen existing files, create none -t test compressed archive data
-u update files, create if necessary -z display archive comment
-x exclude files that follow (in xlist) -d extract files into exdir
modifiers: -q quiet mode (-qq => quieter)
-n never overwrite existing files -a auto-convert any text files
-o overwrite files WITHOUT prompting -aa treat ALL files as text
-j junk paths (do not make directories) -v be verbose/print version info
-C match filenames case-insensitively -L make (some) names lowercase
-$ label removables (-$$ => fixed disks) -V retain VMS version numbers
-M pipe through "more" pager -s spaces in filenames => '_'
Examples (see unzip.txt for more info):
unzip data1 -x joe => extract all files except joe from zipfile data1.zip
unzip -fo foo ReadMe => quietly replace existing ReadMe if archive file newer
Posted: Thu Apr 05, 2007 10:26 pm
by chulett
Excellent. And freeware to boot.
http://www.info-zip.org/
I'm sure there's an equivalent for the command line package for WinZip which I have, didn't bother to check the syntax. Only caveat there is you need to have the
registered version of WinZip, not still be freeloading off the 'evaluation' copy.
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