I want to find the latest file and wanted to move it in a different folder.

[Kurt_Bremser]

See my answer in your other thread.

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@annypanny wrote:
and what if it is a extrnal file not sas dataset? just asking for curiosity then we can't use libname then how can I do that?

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[annypanny]

sure, how can I move a dataset in to different location?
By using X command?

[Kurt_Bremser]

SAS provides a function for copying files:

FCOPY Function

[annypanny]

And how can I delete a file if it's age is more than 30 days?

[Kurt_Bremser]

The documentation for the FDELETE function is just one down from the one for FCOPY. Everything else is just a matter of conditions and date calculations, read: basic data step programming.

[kelxxx]

/*Where the files in*/
%let repfic=H:\;

/*Where to move*/
%let repmove=H:\Batch;

/*ficrep contains all files name in the &refic*/
FILENAME ficrep PIPE "dir /b &repfic";

/*create table SAS = ficrep, it is necessary if in ficrep have the other file*/
data toto;
infile ficrep end=eof;
length x $50;
input x;
run;


/*traitement*/
data tata;  /*data _null_;*/
set toto(where=(x like "online%"));
length _repname _repmove $200;

_y=put(date(),yymmddN.); /*date today 20200414*/
_over30=put(date()-30,yymmddN.); /*date aged 30day 20200315*/
_datex=substr(x,11,8);			/*date in filename*/
_repname=cats("&repfic",x);		/*H:\onlineuseryyyymmdd.txt*/
_repmove=catx(" ",x,"&repmove");	/* onlineuseryyyymmdd.txt H:\batch*/

if _datex le _over30 then do;
delete=1;						/*if file aged over 30 days */
Call system(catx(" ","del /Q",_repname));	/*execute a command line windows del /q H:\onlineuseryyyymmdd.txt */
end;										/*    = suppress the file*/
if _datex = _y then do;
move=1;
call system(cats("move /Y &repfic\",_repmove));	/*move /y h:\onlineuseryyyymmdd.txt H:\batch*/
end;												/* move the file to the path spécified*/
drop _:;
run;

I'm not sure thit is what you want but i hope this can help you.