AT&T 6300 Programmer's Manual page 350

LSET and RSET
Statements
Examples
7-194
150 LSET AS=MKSS(AMT)
160 LSET DS=MKIS(COUNT%)
LSET or RSET may also be used with a
nonfielded string variable to left-justify or
right-justify a string in a given field. For
example, the program lines:
110 AS
=
SPACES(20)
120 RSET AS
=
NS
right-justify the string N$ in a 20-character
field. This is useful when formatting printed
output.