# t-bck command

The t-bck command *backspaces* the
tape to the end of the previous file or a specified number of blocks.

**For Windows:**Not Supported

Warning: The t-bck command is only reliable on floppy
disks and 1/2-inch tapes. SCTs cannot go backwards, so the t-bck command may fail. The last block read may still be
in the buffer, which can be useful for reading labels. SCTs usually
must be rewound with the t-rew command and moved
forward with the t-fwd or t-space command to the desired tape file.

## Syntax

```
t-bck {number}
```

## Parameter(s)

| number | Indicates the number of blocks to backspace. If the number is not specified, the tape backspaces to a position immediately preceding the previous EOF mark, or to load point. Before reading the next file, a t-fwd command must be issued to position the tape after the EOF mark. |
| --- | --- |

## See also

- [t-bsf command](https://d3codex.com/tcl/t-bsf-command/)
- [t-bsr command](https://d3codex.com/tcl/t-bsr-command/)
- [t-fwd command](https://d3codex.com/tcl/t-fwd-command/)
- [t-space command](https://d3codex.com/tcl/t-space-command/)
- [Tape handling commands](https://d3codex.com/definitions/tape-handling-commands/)

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Source: https://d3codex.com/tcl/t-bck-command/ - part of the D3Codex reference.