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# PetscViewerSetOptionsPrefix
Sets the prefix used for searching for `PetscViewer` options in the database during `PetscViewerSetFromOptions()`. 
## Synopsis
```
#include "petscviewer.h" 
PetscErrorCode PetscViewerSetOptionsPrefix(PetscViewer viewer, const char prefix[])
```
Logically Collective


## Input Parameters

- ***viewer -*** the `PetscViewer` context
- ***prefix -*** the prefix to prepend to all option names



## Note
A hyphen (-) must NOT be given at the beginning of the prefix name.
The first character of all runtime options is AUTOMATICALLY the hyphen.




## See Also
 [](sec_viewers), `PetscViewer`, `PetscViewerSetFromOptions()`, `PetscViewerAppendOptionsPrefix()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/sys/classes/viewer/interface/view.c.html#PetscViewerSetOptionsPrefix">src/sys/classes/viewer/interface/view.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex11.c.html">src/ts/tutorials/ex11.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/classes/viewer/interface/view.c)


[Index of all Viewer routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)