Syntax

os.fputs

Write content to a file.


    
    
    
fputs(filename, content)


    
    
    
fputs(filename, content, append)

Examples

Save strategy configuration to file.


    javascript
    
    
function main() {
    let config = '{"strategy": "MA", "period": 20}'
    let bytesWritten = os.fputs("strategy_config.json", config)
    Log("Bytes written:", bytesWritten)
    // Output: Bytes written: 32
    Log(`os.fgets("strategy_config.json"):`, os.fgets("strategy_config.json"))
    // Output: os.fgets("strategy_config.json"): {"strategy": "MA", "period": 20}

    // append a log line
    let logInfo = "\n[" + new Date().toISOString() + "] Config saved"
    os.fputs("strategy_config.json", logInfo, true)
    Log(`os.fgets("strategy_config.json"):`, os.fgets("strategy_config.json"))
    // Output: os.fgets("strategy_config.json"): {"strategy": "MA", "period": 20}
    // [2025-09-08T07:20:30.563Z] Config saved
}

Returns

Type	Description
number	Returns the actual number of bytes written.

Arguments

Name	Type	Required	Description
filename	string	Yes	File path.
content	string	Yes	Content to write.
append	bool	No	Whether to write in append mode, defaults to false (overwrite mode).