how to show last month dataset only

[SRINIVAS_N]

Hi Everyone,

Can any one help me 

I have library name called 'op' in the library i have a datasets looks like

abc_201301

abc_201302

abc_201303

abc_201304

.

.

.

.

abc_201801

abc_201802

abc_201803

abc_201804

abc_201805

abc_201806

abc_201807

abc_201808

abc_201809

till the last month 

ex:if i ran a program the dataset today, it will create this year lastmonth(201809)

How can i show only last month dataset name

if the last month dataset is created show only last month dataset name ,if not created it should exit 

[mkeintz]

Please give a skeleton program.  I don't know what you mean by "exit".  Do you mean end the sas session?  Skip some other program steps?

Editted note.  Here's something close to what I think you want:

%let dsname=op.abc_%sysfunc(intnx(month,%sysfunc(today()),-1),yymmn6.);

%macro existds(name);
  %if %sysfunc(exist(&name)) %then 1;
  %else 0
%mend existds;
%put Dataset &dsname exist dummy is %existds(&dsname);

The main thing here is, given today's date, constructing the data set name corresponding to last month (op.abc_201809).  Above it's constructed in macro language.  In a data step, it would look something like:

data _null_;
  dsname=cats('op.abc_',put(intnx('month',today(),-1),yymmn6.));
  d=exist(dsname);
  put d=;
run;

[SRINIVAS_N]

If the current year previous month dataset is not present then it stop the
searching the dataset and come out of the loop

[mkeintz]

What loop?  Please show the code that implements the loop.