use std::os::unix::ffi::OsStrExt;

use std::os::unix::ffi::{OsStrExt, OsStringExt};

        .map(|arg| OsStr::from_bytes(&arg.as_bytes().replace("%f", bfilename)).to_owned());

        .map(|arg| OsString::from_vec(arg.as_bytes().replace("%f", bfilename)));