• Lua

file = io.tmpfile()

• C

const char tmpl[] = "XXXXXX.tmp";
int fd = mkstemp(tmpl);

• Clojure

(File/createTempFile "prefix" "suffix" (new File "/tmp"))

• Clojure

(File/createTempFile "prefix" "suffix")

• C#

string file = Path.GetTempFileName();

• D

auto f = File.tmpfile();

• Fortran

open (newunit=u,status="scratch")

• Go

tmpfile, err := os.CreateTemp("", "")

• Haskell

withTempFile $ \f -> do
  -- do something with f

• JS

const tempFile = tempy.file()

• JS

const resultOfCallback = tempy.file.task(tempFile => {
 // do something with tempFile
})

• Java

File tempFile = File.createTempFile("prefix-", "-suffix");
tempFile.deleteOnExit();

• PHP

$f = tmpfile();

• Pascal

var
  H: THandle;
begin
  H := FileCreate(GetTempFileName);
end.

• Perl

my $path = tempfile;

• Perl

my $fh = tempfile();
# or
my ($fh, $filename) = tempfile();

• Python

file = tempfile.TemporaryFile()

• Ruby

file = Tempfile.new('foo') 

• Rust

let temp_dir = TempDir::new("prefix")?;
let temp_file = File::open(temp_dir.path().join("file_name"))?;