## `Pref::echo` -- suppress displaying of user inputs

#### Introduction

`Pref::echo(`FALSE`)` suppresses the displaying of user inputs.

#### Call(s)

`Pref::echo( <value>)`

#### Parameters

`value` | - | `TRUE`, `FALSE` or `NIL`

#### Returns

the previously defined value

#### Details

- `Pref::echo(`FALSE`)` suppresses the displaying of user inputs. This is useful when using MuPAD without frontend and inputs should not be printed on screen. `Pref::echo(`TRUE`)` enables the printing of any input.
- `Pref::echo`works only in the terminal version of MuPAD.
- A call of `Pref::echo` without arguments will return the current value. The argument `NIL` will reset the default value, which is `TRUE`.

#### Changes

- no changes

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