You think right direction, but... Here is samsungs limitations. If you copy non existing file that way, it will be copied with sufix _cloneSo do you think it woud work to make an entry like "/0001" and have a file on the called 0001 containing the linux cmd eg like "ls"
If you copy existing file, it will be copied with sufix _temp (or another, i do not remember).
So, you can enter shell commands, but... it executes scripts only from specific location (/mtd_boot/CIP), which is read only and watched by authuld.