Function run_piped 

pub fn run_piped(
    command_str: &str,
    input: &str,
    timeout: Option<Duration>,
) -> Result<String, ShellError>

Execute a shell command with the given input piped to stdin.

Returns the command’s stdout on success.

Arguments

• command_str - The shell command to execute
• input - Data to write to the command’s stdin
• timeout - Optional timeout; if exceeded, the process is killed

Notes

The entire stdout is buffered in memory before being returned. For very large outputs (multi-megabyte), consider streaming alternatives.