how to do %let prefix in txt %letPrefix = 'B' in a sas statement how do i replace a prefix in sas sas string replace how to put prefix into variable sas string replace sas c++ string replace what string is used for filename in sas sas how to insert prefix in file name what is the string used in sas to create the file how to get the prefix from file in sas which prefix is used to rename a file in sas sas string replace how to replace a string in sql what is a string replace can the file name be read only once by using the prefix b in sas when to put prefix in tesla what sas statements do i write in b sas rename variable with prefix what is the prefix in txt file