Busybox is installed in /system/bin
successfully already, but I still can't call it as instructed in Using cut or sed in Android busybox:
C:\Users\Acer\Downloads\adb>adb shell whence sed
/system/bin/sed
C:\Users\Acer\Downloads\adb>adb shell whence busybox
/system/bin/busybox
C:\Users\Acer\Downloads\adb>busybox
'busybox' is not recognized as an internal or external command,
operable program or batch file.