File.flush

Flush the file buffer to ensure data is written to disk.

    
    
    
flush()

Examples

Write important log data in real-time.

    javascript
    
    
function main() {
    let logFile = os.open("critical.log", "a")
    logFile.printf("[%s] Critical event occurred\n", new Date().toISOString())   // [2025-09-09T03:15:43.895Z] Critical event occurred
    logFile.flush()  // Immediately write data to disk
    // Continue with other operations...
    logFile.close()
}

See Also