ratiscat

rat is a performance oriented re-implementation of cat in rust

See rat.rs

For a fully fledged coreutils rust stack see uutils:

https://github.com/uutils/coreutils/

Usage

rat vs. cat

``` $ rat

$ cat

$ echo test | ./rat - /does/not/exists /etc/hosts /does/not/exists2 | md5sum rat: /does/not/exists: No such file or directory rat: /does/not/exists2: No such file or directory 27f2e6689a97a42813e55d44ef29cda4 -

$ echo test | cat - /does/not/exists /etc/hosts /does/not/exists2 | md5sum cat: /does/not/exists: No such file or directory cat: /does/not/exists2: No such file or directory 27f2e6689a97a42813e55d44ef29cda4 -

```

Motivation

I just wanted to do this as a learning experience for rust.

At least, that's how it started.

Things learned in relation to rust:

• Stdout in rust will always be wrapped by LineWriter which flushes on new line

Wrap the raw file descriptor in BufWriter<File> instead for more control

• Pre-allocation given a Sized Vec<u8> for buffer has some interesting impacts on runtime performance

Even when that vector is immediately cleared on runtime the behavior between initially empty vs. initially Sized vector is noticeable

Known Bugs

• Ctrl+D needs to be pressed twice while interactive