thanks a lot for ur info! i am not upto to what you have updated....
i played around and got where the problem is:
I have a dataset file copied in Windows called test_run.sas7bdat and zipped it and transferred to Unix box using WinSCP.
Code:
server1:/home/arunpr# ls -lrt
-rw-r----- 1 arunpr user 3647 Jun 06 07:37 test_run.zip
server1:/home/arunpr# gunzip test_run.zip
gunzip: test_run.zip: unknown suffix -- ignored
server1:/home/arunpr# gunzip -S .zip test_run.zip
server1:/home/arunpr# ls -lrt
-rw-r----- 1 arunpr user 23784 Jun 06 07:37 test_run
My gunzip is successful but i lost the extension and i am also not able to read this unzipped dataset from SAS EG.
Please advise how to get the dataset normally when i do this kind of gunzip... is there any more option need to be included?
And one more scenario:
I have one more file (which is my friend kept in my work area and not sure what method he used to transfer/load that .zip file to unix box) which is 354258928 Bytes in size and when i perform the same gunzip options i am getting the below error:
Code:
server1:/home/arunpr# gunzip -S .zip HILTON.zip
gunzip: HILTON.zip: first entry not deflated or stored -- use unzip
Is that size is restricting me or my friend copied in different way which corrupted this zip file?
the rename worked for me.... sas able to read the dataset without any issues.
The actual .zip file what i have is 337 MB in size then probably it will be more than a GB when unzip the the same (not sure).
And i am not sure why i am not able to perform the below and getting the error.... is this because the file size constraint? and i have enough space in the file system too.
Code:
server1:/home/arunpr# gunzip -S .zip HILTON.zip
gunzip: HILTON.zip: first entry not deflated or stored -- use unzip
Location: Saint Paul, MN USA / BSD, CentOS, Debian, OS X, Solaris
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Hi.
The gunzip command, like most of the *nix commands, does one thing well. In the case of gzip / gunzip, that is compressing / uncompressing files. It does not gather files together like many Windows utilities, zip, winzip, pkzip, etc. In the *nix world, the gathering is done with a separate utility, the most common being tar.
So the usual method of working in *nix is run tar to get a single file of a collection of files, and then, as a separate step, compress that file. The result is often a name that looks like name.tar.gz.
The gunzip command, as a convenience, will uncompress a zip file, but only if it has a single element. The way that gunzip works is to uncompress the file to a temporary file, and (effectively) copy that file back onto the name.zip file, so the original file is essentially replaced. Other utilities allow the name.zip file to remain, and create additional files that were in the archive. Both the commands unzip and 7z work like that.
So if one has a zip archive with more than one element, one needs to:
a) use a command different from gunzip, or
b) re-create the zip archive with single elements.
I quickly wrote a script that illustrates many of the topics we have discussed:
Code:
#!/usr/bin/env bash
# @(#) s0 Demonstrate file extension issues with unzip, gunzip, 7z.
# 7zip: http://p7zip.sourceforge.net/
pe() { for i;do printf "%s" "$i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
# export PATH="/usr/local/bin:/usr/bin:/bin"
version >/dev/null 2>&1 && version "=o" unzip 7z && gunzip -V | head -1
rm -f t1 t1.zip t1.sas7bdat t2 t2.zip t2.sas7bdat
FILE=${1-data1}
pl " Data file $FILE:"
head -20 $FILE
pl " Create zip files with more than one element:"
rm -f t1.zip t1.sas7bdat t2.sas7bdat
cp $FILE t1.sas7bdat
cp $FILE t2.sas7bdat
zip t1.zip t1.sas7bdat t2.sas7bdat
file t1.zip
ls -lgG t1.sas7bdat t2.sas7bdat t1.zip
pl " unzip with gunzip, expect failure, more than one element in archive":
rm -f t1.sas7bdat t2.sas7bdat
gunzip -S .zip t1.zip
ls -lgG t*
pl " unzip with 7z, expect success with multiple elements:"
rm -f t1.zip t1.sas7bdat t2.sas7bdat
cp $FILE t1.sas7bdat
cp $FILE t2.sas7bdat
zip t1.zip t1.sas7bdat t2.sas7bdat
file t1.zip
rm -f t1.sas7bdat t2.sas7bdat
ls -lgG t*
7z x t1.zip
ls -lgG t*
pl " Re-create zip file with only one element:"
rm -f t1.zip t1.sas7bdat t2.sas7bdat
cp $FILE t1.sas7bdat
zip t1.zip t1.sas7bdat
file t1.zip
ls -lgG t1.sas7bdat t1.zip
pl " unzip with unzip (keeps t1.zip):"
zip t1.zip t1.sas7bdat
rm t1.sas7bdat
unzip t1.zip
ls -lgG t1.sas7bdat t1.zip
pl " unzip with gunzip (removes t1.zip, loses extension):"
gunzip -S .zip t1.zip
ls -lgG t1*
pl " Unzip with 7z (keeps t1.zip):"
rm -f t1.zip t1.sas7bdat
cp $FILE t1.sas7bdat
zip t1.zip t1.sas7bdat
rm t1.sas7bdat
7z x t1.zip
ls -lgG t1.sas7bdat t1.zip
exit 0
producing:
Code:
% ./s0
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution : Debian GNU/Linux 5.0
UnZip 5.52 of 28 February 2005, by Debian. Original by Info-ZIP.
7z - ( /usr/bin/7z Jun 21 2008 )
gzip 1.3.12
-----
Data file data1:
Albuquerque, N.M.
Arlington, Texas
Atlanta, Ga.
Austin, Tex.
Baltimore, Md.
Boston, Mass.
Charlotte, N.C.
Chicago, Ill.
Cleveland, Ohio
Colorado Springs, Colo.
-----
Create zip files with more than one element:
adding: t1.sas7bdat (deflated 21%)
adding: t2.sas7bdat (deflated 21%)
t1.zip: Zip archive data, at least v2.0 to extract
-rw-r--r-- 1 160 Jun 7 08:23 t1.sas7bdat
-rw-r--r-- 1 538 Jun 7 08:23 t1.zip
-rw-r--r-- 1 160 Jun 7 08:23 t2.sas7bdat
-----
unzip with gunzip, expect failure, more than one element in archive:
gzip: t1.zip has more than one entry -- unchanged
-rw-r--r-- 1 538 Jun 7 08:23 t1.zip
-----
unzip with 7z, expect success with multiple elements:
adding: t1.sas7bdat (deflated 21%)
adding: t2.sas7bdat (deflated 21%)
t1.zip: Zip archive data, at least v2.0 to extract
-rw-r--r-- 1 538 Jun 7 08:23 t1.zip
7-Zip 4.58 beta Copyright (c) 1999-2008 Igor Pavlov 2008-05-05
p7zip Version 4.58 (locale=C,Utf16=off,HugeFiles=on,1 CPU)
Processing archive: t1.zip
Extracting t1.sas7bdat
Extracting t2.sas7bdat
Everything is Ok
Files: 2
Size: 320
Compressed: 538
-rw-r--r-- 1 160 Jun 7 2010 t1.sas7bdat
-rw-r--r-- 1 538 Jun 7 08:23 t1.zip
-rw-r--r-- 1 160 Jun 7 2010 t2.sas7bdat
-----
Re-create zip file with only one element:
adding: t1.sas7bdat (deflated 21%)
t1.zip: Zip archive data, at least v2.0 to extract
-rw-r--r-- 1 160 Jun 7 08:23 t1.sas7bdat
-rw-r--r-- 1 280 Jun 7 08:23 t1.zip
-----
unzip with unzip (keeps t1.zip):
updating: t1.sas7bdat (deflated 21%)
Archive: t1.zip
inflating: t1.sas7bdat
-rw-r--r-- 1 160 Jun 7 08:23 t1.sas7bdat
-rw-r--r-- 1 280 Jun 7 08:23 t1.zip
-----
unzip with gunzip (removes t1.zip, loses extension):
-rw-r--r-- 1 160 Jun 7 08:23 t1
-rw-r--r-- 1 160 Jun 7 08:23 t1.sas7bdat
-----
Unzip with 7z (keeps t1.zip):
adding: t1.sas7bdat (deflated 21%)
7-Zip 4.58 beta Copyright (c) 1999-2008 Igor Pavlov 2008-05-05
p7zip Version 4.58 (locale=C,Utf16=off,HugeFiles=on,1 CPU)
Processing archive: t1.zip
Extracting t1.sas7bdat
Everything is Ok
Size: 160
Compressed: 280
-rw-r--r-- 1 160 Jun 7 2010 t1.sas7bdat
-rw-r--r-- 1 280 Jun 7 08:23 t1.zip
Best wishes ... cheers, drl
Last edited by drl; 06-07-2010 at 01:43 PM..
Reason: ( edit 1 - minor typos )
in short: gunzip is not unzip. they are not the same command. gunzip is related to zip only by ancestry, for .zip files use unzip. for gz files use gunzip. If you don't have unzip, get it, your OS and distribution is all but guaranteed to have the most ported program on the planet.
Last edited by Corona688; 06-07-2010 at 01:41 PM..
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