Matter with unzipping a big file sas support communities. This is followed by a number of examples which should demonstrate how the two commands can be used directly from the ms dos command prompt or from within sas. Accessing and extracting data from internet using sas. This paper mainly deals with usage of the x, systask and sas filename statements in combination with the pipe device type to interact with the host operating system and how these. At times, writing macros to unzip files in sas can be be tedious and messy.
At the end of a sas program, i zipped the final dataset 20gb using the ods package method. Harini kunduru, bristol myers squibb company, pennington, usa. Using filename zip to unzip and read data files in sas. Given a folder with many zip files, most of them containing a file called bla. Ranganath bandi, clinirx research usa, chicago, usa. The filename statement associates a sas fileref a file reference name with an. This paper really originated many years ago after i had experimented with unzipping flat files within sas programs using unnamed pipes on an aix unix system. I am a newbie to sas programming and i need a help on unzipping the. What if we want to download and extract the information automatically using sas and. I also got this message when i tried to unzip a file that was still being downloaded.
Apparent invocation of macro not resolved in sas filename pipe. Like ods package, the filename zip method does not support encrypted passwordprotected zip archives. We can use sas filename statement to invoke unnamed piping. Reading and updating zip files with filename zip the sas. It allows users to submit windows command or enter operating environment mode without ending the sas session. Two sas macros are then presented, %wzzip and %wzunzip. You can either do it manually when you receive the file, or pipe an os command out using x. This paper shows different ways to read compressed data, considering several formats and software tools used to produce archives. All is known is that every file has a single file, which is a txt file. Unzip command d option tells where to write extracted files. In sas, how do i read data from a compressed or zip file. Therefore, you have the choice of having multiple sas sessions that communicate with each other or one sas session communicating with another windows application. Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. In the next example, the stdin fileref is used to read input through a pipe into the sas command, which, in turn, executes the sas program.
Are you seeing errors or other messages in the log. Using sas filename statement to extract directory file. Ive written about how to use the filename zip method to read and update zip files in your sas programs. At that chapter s is missing with the url fileaccess. Associates a sas fileref with an external file or an output device, disassociates a fileref and external file, or lists attributes of external files. Is the devicetype keyword that tells sas that you want to use an unnamed pipe. The data statement names the data set that will be read in e. Outlineintroductionweb elementstoolsexamples urlshtml urls this is the. Manage external files with sas programming paper 3262. I want to use sas to unzip these and then use them as data within my sas process. What you want to do is, make unzip take a zipped file on its standard input rather than as an argument. I have over 100 files to unzip and therefore i want to do it automatically with sas.
If you are certain that your ziparchive contains only one file you can extract it to a different filename with. Download a unix zipped file from the web sas support. The filename statement can assign a fileref to any unix pipe with the syntax. For example, you can use the printto procedure to direct the results from sas procedures to another windows application, using a named pipe.
Although both are forms of compressed files, a gzip file is usually a compressed copy of a single file, whereas a zip file is an archive a collection of files in. Reading and writing gzip files with sas the sas dummy. Im trying to decompress a file in the zip format using pure sas code, that i can integrate as one of. I am a newbie to sas programming and i need a help on unzipping the gz and zip files using sas. This example demonstrates sas ability to capitalize on operating environment capabilities.
At the time the paper was written, the sas xml mapper is available for download at. Accessing and extracting data from the internet using sas. By placing the piping operation outside the sas program, the program becomes more general. Taking advantage of the pipe device of the filename statement and the aid of some tools free to use, you can directly read compressed data without extracting them first. The applications can be sas sessions or other windows applications. Using the filename statement requires information specific to your operating environment. In bsdbased unix systems, you use the ps ax command the operating environment uses pipes to send the output from ps to the grep command, which searches for every occurrence of the string sas.
Z and which begins with the correct magic number with an uncompressed file without the original extension. The filename statements pipe option allows you to direct the output of operating system commands into sas for further processing. The view option v is followed by a second option b, for a brief description of the contents. When i tried to unzip files in sas first time, i struggled a lot. Information such as the file size and compression ratio is provided for each of the elements in the zip file. An autoexec file contains sas statements and commands that you set up to execute automatically each time you invoke sas. This is usually easily supported by gzip and tar kind of tools with a argument.
The ps e command produces a listing of all active processes in the system, including the name of the command that started the task. For example, heres how you extract the list of files in your unix home directory into sas. This directory says where, within the archive each file is located and thus allows for quick, random access, without reading the entire archive. Sas unzip command posted 112015 9480 views in reply to astounding i ran both command one by one and for both command line its prompting 2 windows, the sas system x command window is active window and cmd command prompt windows. This is a repost of my answer to a similar question the zip file format includes a directory index at the end of the archive. Add files to a zip archive with filename zip the sas dummy. Pdf accessing and extracting data from the internet using sas. In order to make use of it, a file decompressor was downloaded.
You need to decompress the file first, there is no functionality at this time to unzip within sas. But the standard unzip does not do that though, it does support extraction to a pipe. If lrecl is not specified, the default value of 32767 bytes is used to read from or. I believe this is something happening because of pipe option is not enable for sas eg. I realy don not know if this is possible s on unix with url access. Heres a sas note with an example which assumes the data was compressed via sas and the compress command. Reading from and writing to unix commands pipe sas support. Building an extract, transform, and load etl server using base sas. Accessing and extracting data from internet using sas george zhu, sunita ghosh alberta health services cancer care. Using filename zip to unzip and read data files in sas the sas. Unzipping and renaming files using x command in sas. External tools can be used to decompress data files into a pipe. Below is an example that creates a permanent sas dataset and zips it up.
With filename pipe statement, you dont need to save the html. The power of the filename statement, continued 2 pipe unnamed pipes enable you to invoke a program outside of sas and redirect the programs input, output, and error. They should help to make it easier to use this software from within sas. The available file attributes can differ according to the type of file filename access method that is used. The program in the previous example has been changed and stored in file ps. Usefully, the windows dir command with its s switch and the unix equivalent ls allow you get a file listing into sas. The issued command will be directed to external programs, and the execution results will feed back to sas via piping. Sas can uncompress the file on the fly and never create a separate uncompressed version of the file.
Ahs cancer care accessing and extracting data from internet using sas. The sas code asis will log anything that the unzip command writes to standard out. Using compressed data files in sas dartmouth services portal. Its purpose is to automate the execution of statements, commands, and entire programs that you use routinely in sas processing. Zip files, as you can guess, have some attributes that are specific to them. The filename statement south central sas users group. It is possible to process infile or file with pipes much like process with set or data can be used with internal or external commands sas. The ll option forces conversion of every filename to lowercase, regardless of the originating file system. Ive written about how to use the filename zip method to read and. The most common approach is to use filename pipe to run a.
How to create zip files with ods package zip available since sas 9. The finfo function in sas provides access to file attributes and their values for a given file that youve accessed using the fopen function. You can insert a filename statement in the sas autoexec file to automatically start and end a sasconnect server session. The goal is to unzip many zip files and rename the resulting file to the original archive name. Running server side pipes requires the sas server to be running with system option xcmd active. Taking advantage of the pipe device of the filename statement and the aid of some tools free to use, you. Similarly, the pipe command can be used to initiate a wide array of processes. The filename statement specifies the type of file you wish to unzip e. Sas piping functionality piping is a channel of parallel communications between sas and other external applications. Use the uncompress command to expand the file and then sas will be able to read it.
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