The ornamental design for a singlesidedshelvingpost, as shown and described.
FIG. 1 is a perspective view of a single sided shelving post, showing the new design;
FIG. 2 is a top view thereof;
FIG. 3 is a right-hand view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a left-hand view thereof;
FIG. 6 is a front view thereof; and,
FIG. 7 is a rear side view thereof.
The broken line showings are included for the purpose of illustrating environment and form no part of the claimed design. The break lines shown in FIGS. 1, 2, 4, 6 and 7 are not part of the claimed design and represent that no particular length is claimed.