How to unzip a file via SAS (via SAS Studio / SSOD)

[the_yeti]

I'm trying to decompress a file in the zip format using pure SAS code, that I can integrate as one of the steps of a SAS script. I'm running SAS via the web version of SAS Studio on the cloud hosted version (SSOD).

Reading the documentation, I was able to come up with this, which attempts to expand all files in the zip to the same directory: 

data _null_;
  infile "unzip /project/input/file.zip" pipe ;
  input ;
  put _infile_;
run;

But I couldn't find how to tell it a specific directory to write the files, and I couldn't find how I extract a specific file from the zip file.

[Kurt_Bremser]

You could first extract a list of files, and then extract all files one-by-one to stdout, all by using filename pipe.

See the documentation of unzip: https://linux.die.net/man/1/unzip 

[ChrisHemedinger · Accepted solution]

If using a hosted SAS, you might not have the unzip command (OS shell) as an option.  But you can use the FILENAME ZIP method to list and read files.

[the_yeti]

That works! Thank you

[jrsousa2]

That doesn't work.

Can you let me know exactly how to extract just a single file from a gz?

Here's my code. The directory is in a Unix server. This crashes even if I add GZIP at the end of the filename clause.

23 GOPTIONS ACCESSIBLE;
24 filename inzip ZIP "/home/jrsousa2/my_content/discogs_20081014_releases.xml.gz";
25
26 /* identify a temp folder in the WORK directory */
27 %let Nome=discogs_20081014_releases.xml;
28 filename xml "%sysfunc(getoption(work))/&Nome" ;
29
30 %put ### %sysfunc(getoption(work));
### /saswork/SAS_workF376000058C4_odaws02-prod-us/SAS_work3611000058C4_odaws02-prod-us
31
32 /* hat tip: "data _null_" on SAS-L */
33 data _null_;
34 /* using member syntax here */
35 infile inzip(&Nome) lrecl=256 recfm=F length=length eof=eof unbuf;
36 file xml lrecl=256 recfm=N;
37 input;
38 put _infile_ $varying256. length;
39 return;
40 eof:
41 stop;
42 run;
ERROR: The file "/home/jrsousa2/my_content/discogs_20081014_releases.xml.gz" exists and is not a zip file. The output file must be
a zip file.
43
44 GOPTIONS NOACCESSIBLE;
45 %LET _CLIENTTASKLABEL=;
46 %LET _CLIENTPROCESSFLOWNAME=;
47 %LET _CLIENTPROJECTPATH=;
48 %LET _CLIENTPROJECTNAME=;
49 %LET _SASPROGRAMFILE=;
50
51 ;*';*";*/;quit;run;
52 ODS _ALL_ CLOSE;

[Kurt_Bremser]

What did you get when you used the gzip option?

What version of SAS do you have? gzip was introduced with 9.4M5.

[jrsousa2]

It seems that I was able to make the code work.

It didn't issue me any error messages, I had to modify the code though.

I ran this on SAS for academics, EG 7.1 or so:

%let Arq=%sysfunc(getoption(work))/releases.xml;

filename fromzip ZIP "/home/jrsousa2/my_content/releases.xml.gz" GZIP;
filename target "&Arq" encoding='utf-8';
 
data _null_;   
   infile fromzip;
   file target ;
   input;
   put _infile_ ;
run;