Handling leading, trailing blanks in macro variable

If a macro variable contains leading or trailing blanks, they can be easily removed without the use of %LEFT or %TRIM. Simply:

%let macvar = &macvar;

KUPDATE - replace nth position

KUPDATE(argument,position,n <, characters-to-replace > )
KUPDATE(argument,position <,n > , characters-to-replace)
Inserts, deletes, and replaces character value contents.
Product: Base SAS
Document: SAS National Language Support: Reference Guide

Link: kupdate

Function to get file path & name

%sysfunc(getoption(sysin));

Used in title of footnote or PUT statement to display the location of SAS source code.

SYSIN a system option, can be look up in table sashelp.voption under UNIX.

Link: getoption
Link: sysin