Overwrite or Duplicate

Almost all Frida methods that modify a file can either overwrite the input (in-place) or duplicate it.

There is no speed difference between the two modes — it is purely a workspace management question.

Default policy

Every command has a suitable built-in default:

• Irreversible operations duplicate by default (to protect the original).
• Easily reversed operations overwrite by default.

Forcing in-place operation

Append ! to any command to force overwriting:

2 > oi! y[,,0]

Without !, oi would duplicate file 2. With !, it operates in place.

When to prefer each mode