title: wm/am not found from adb shell
body: <p>Phone: OnePlus 3t. Rooted. No updates.
  Booting problems, so adb started from TWRP recovery screen.</p>
  
  <p>Whether I enter "wm size reset" or "am size display-reset", it is telling me "/sbin/sh/: wm: not found" or "/sbin/sh: am: not found" respectively. 
  If I try it in TWRP terminal I get the same, except "sh:" instead of "/sbin/sh/:".</p>
  
  <p>First time using adb tools, so I could be doing something basic wrong. 
  Can't use phone until I manage to fix the resolution issue. Grateful for any help.</p>