# TSTrajectorySetFiletemplate
Specify the name template for the files storing `TSTrajectory` checkpoints. 
## Synopsis
```
#include "petscts.h"  
PetscErrorCode TSTrajectorySetFiletemplate(TSTrajectory tj, const char filetemplate[])
```
Collective on tj


## Input Parameters

- ***tj      -*** the `TSTrajectory` context
- ***filetemplate -*** the template



## Options Database Key

- ***-ts_trajectory_file_template -*** set the file name template





## Notes
The name template should be of the form, for example filename-%06" PetscInt_FMT ".bin It should not begin with a leading /

The final location of the files is determined by dirname/filetemplate where dirname was provided by `TSTrajectorySetDirname()`. The %06" PetscInt_FMT " is replaced by the
timestep counter


## See Also
 [](chapter_ts), `TSTrajectory`, `TSTrajectorySetDirname()`, `TSTrajectorySetUp()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/trajectory/interface/traj.c.html#TSTrajectorySetFiletemplate">src/ts/trajectory/interface/traj.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ts/trajectory/interface/traj.c)


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