pamflip(1) on Linux
The text 318f90571ba6, as Debian 12 (Bookworm) shipped it.
flip or rotate a PAM or PNM image
Flags it lists
-
-ccw -
-cw -
-leftright -
-lr -
-memsize -
-null -
-pagesize -
-r180 -
-r270 -
-r90 -
-rotate180 -
-rotate270 -
-rotate90 -
-tb -
-topbottom -
-transpose -
-verbose -
-xform -
-xy