:orphan:
# PetscViewerAppendOptionsPrefix
Appends to the prefix used for searching for `PetscViewer` options in the database during `PetscViewerSetFromOptions()`. 
## Synopsis
```
#include "petscviewer.h" 
PetscErrorCode PetscViewerAppendOptionsPrefix(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`, `PetscViewerGetOptionsPrefix()`, `PetscViewerSetOptionsPrefix()`

## Level
advanced

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


---
[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)