# f command (Editor processor)

The f command files the dual Editor
buffers so that additional changes may be made to an item, or to review
previous changes. After filing, the line pointer is positioned to
the beginning (top) of the item. Changes to items must be made from
the top down. This means that changes may not be made to any line
above a line that a change has already been made without previously
using the f command.

## Syntax

```
 f
```

## Description

As a general rule, use the f command whenever changes are required above the last
line that a change was made, or upon receiving a seqn? error message.

## Example(s)

The most common error message
is the seqn? message. It indicates that a change is
being attempted to a line *above* a line that a change has been
made. To correct this, use the f command, then
try the same operation that previously failed.

```

014 print customer-ID
.i print
f
.12
012 print curr.bal
.i
seqn?
```

## See also

- [Error messages](https://d3codex.com/editor/error-messages/)
- [Editor overview](https://d3codex.com/editor/editor-overview/)
- [t command (Editor processor)](https://d3codex.com/editor/t-command-editor-processor/)

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Source: https://d3codex.com/editor/f-command-editor-processor/ - part of the D3Codex reference.