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```{index} single: B::IO
```

# B::IO

```{pperl-module-badges} B::IO
```

## Functions

### Other Functions

#### `LINES`

`$.` - the input line number for this handle.

#### `PAGE`

`$%` - the current format page number.

#### `PAGE_LEN`

`$=` - lines per format page.

#### `LINES_LEFT`

`$-` - lines left on the current format page.

#### `TOP_NAME`

`$^` - the name of the top-of-page format, or undef.

#### `TOP_GV`

The `B::GV` holding the top-of-page format.

#### `FMT_NAME`

`$~` - the name of the body format, or undef.

#### `FMT_GV`

The `B::GV` holding the body format.

#### `BOTTOM_NAME`

The name of the bottom-of-page format, or undef.

#### `BOTTOM_GV`

The `B::GV` holding the bottom-of-page format.

#### `IoTYPE`

The handle's kind as a one-character string: `<` read, `>` write, `+` read-write, `|` pipe, `-` `-` (STDIN via ARGV), `s` socket.

#### `IoFLAGS`

The handle's flag bits (`IOf_ARGV`, `IOf_START`, `IOf_FLUSH`, `IOf_DIDTOP`, `IOf_UNTAINT`, `IOf_NOLINE`, `IOf_FAKE_DIRP`).

#### [`IsSTD`](IO/IsSTD)

True if this IO is one of the three standard handles.

```{toctree}
:hidden:
:maxdepth: 1

IO/IsSTD
```