[stdin]
description = '标准输入。'

[stdout]
description = '标准输出。'

[stderr]
description = '标准错误。'

[close]
description = '关闭 `file` 或默认输出文件。'

[flush]
description = '将写入的数据保存到默认输出文件中。'

[input]
description = '设置 `file` 为默认输入文件。'

[lines]
description = [[
------
```lua
for c in io.lines(filename, ...) do
    body
end
```
]]
[[.enums]]
name = 'mode'
enum = 'n'
description = '读取一个数字，根据 Lua 的转换文法返回浮点数或整数。'
``````````
name = 'mode'
enum = 'a'
description = '从当前位置开始读取整个文件。'
``````````
name = 'mode'
enum = 'l'
description = '读取一行并忽略行结束标记。'
``````````
name = 'mode'
enum = 'L'
description = '读取一行并保留行结束标记。'
``````````
name = 'mode'
code = 'number'
description = '读取一个不超过这个数量字节数的字符串。'

[open]
description = '用字符串 `mode` 指定的模式打开一个文件。'
[[.enums]]
name = 'mode'
enum = 'r'
description = '读模式。'
``````````
name = 'mode'
enum = 'w'
description = '写模式。'
``````````
name = 'mode'
enum = 'a'
description = '追加模式。'
``````````
name = 'mode'
enum = 'r+'
description = '更新模式，所有之前的数据都保留。'
``````````
name = 'mode'
enum = 'w+'
description = '更新模式，所有之前的数据都删除。'
``````````
name = 'mode'
enum = 'a+'
description = '追加更新模式，所有之前的数据都保留，只允许在文件尾部做写入。'

[output]
description = '设置 `file` 为默认输出文件。'

[popen]
description = '用一个分离进程开启程序 `prog` 。'
[[.enums]]
name = 'mode'
enum = 'r'
description = '从这个程序中读取数据。'
``````````
name = 'mode'
enum = 'w'
description = '向这个程序写入输入。'

[read]
description = '读文件 `file`， 指定的格式决定了要读什么。'
[[.enums]]
name = 'mode'
enum = 'n'
description = '读取一个数字，根据 Lua 的转换文法返回浮点数或整数。'
``````````
name = 'mode'
enum = 'a'
description = '从当前位置开始读取整个文件。'
``````````
name = 'mode'
enum = 'l'
description = '读取一行并忽略行结束标记。'
``````````
name = 'mode'
enum = 'L'
description = '读取一行并保留行结束标记。'
``````````
name = 'mode'
code = 'number'
description = '读取一个不超过这个数量字节数的字符串。'

[tmpfile]
description = '如果成功，返回一个临时文件的句柄。'

[type]
description = '检查 `obj` 是否是合法的文件句柄。'
[[.enums]]
name = 'type'
enum = 'file'
description = '是一个打开的文件句柄。'
``````````
name = 'type'
enum = 'closed file'
description = '是一个关闭的文件句柄。'
``````````
name = 'type'
code = 'nil'
description = '不是文件句柄。'

[write]
description = '将参数的值逐个写入默认输出文件。'