Files Manipulation

File Manipulation

READ_FILE <file_path> TO <variable_name>: Read a file's contents.
WRITE_FILE <file_path> WITH <variable_name>: Write to a file.
DELETE_FILE <file_path>: Remove a specific file.
CHECK_FILE_EXISTS <file_path> TO <variable_name>: Check if a file exists.

Example - File Manipulation

Example 1: Read from a file and publish its content.

READ_FILE /path/to/file.txt INTO fileContent
PUBLISH /fileContent WITH fileContent

Explanation

Read File Content The content of the file located at /path/to/file.txt is read and stored into the fileContent variable.
```
READ_FILE /path/to/file.txt INTO fileContent
```
Publish File Content The fileContent variable is then published to the /fileContent MQTT topic.
```
PUBLISH /fileContent WITH fileContent
```
For example, if the content of the file is "Hello, World!", this message will be published to the /fileContent MQTT topic.

Example 2: Write to a file.

SET message TO "Hello, World!"
WRITE_FILE /path/to/file.txt WITH message

Explanation

Set Message The message variable is set to "Hello, World!".
```
SET message TO "Hello, World!"
```
Write to File The message variable is then written to the file located at /path/to/file.txt.
```
WRITE_FILE /path/to/file.txt WITH message
```
This could be used, for example, to store data into a file for later

File Manipulation FAQ

What types of files can I manipulate with Flux?

Flux allows you to manipulate text files, configuration files, and other small data files. It is not designed for manipulating large files or binary files.

Can I read and write to the same file multiple times?

Yes, you can read from and write to the same file multiple times using the READ_FILE and WRITE_FILE commands.

What happens if I try to delete a file that does not exist?

The DELETE_FILE command will return an error if the file does not exist. This can be captured and handled using error events in Flux.

Is it possible to check if a file exists before performing operations on it?

Yes, you can use the CHECK_FILE_EXISTS command to check if a file exists before performing operations on it.