pete / cats Goto Github PK

Implementations of cat(1) from various sources.

C 95.82% Assembly 1.65% Limbo 2.52%

c limbo unix plan9 history bsd gnu

cats's Introduction

Here, placed side-by-side for comparison, are GNU's implementation of
cat, Plan 9's implementation, Busybox's implementation, and NetBSD's
implementation, Seventh Edition Unix (1979), Tenth Edition Unix (1989),
and 4.3BSD.

For good measure (and because I suppose I am now committed to collecting
cats) also included are Second Edition Unix (in assembly) and Inferno's
implementation (in Limbo).

All cat.c files (renamed by prefixing the name of the source source)
are presented, unaltered and in their entirety.  Note how easy it is to
read and understand plan9-cat.c (it should take less than a couple of
minutes possibly even for coders that don't know C).  Other than that,
I think the files speak for themselves.

Keep in mind while reading that the cat utility's purpose is to
concatenate files.

Lastly, here are the line and character counts, sorted:
Lines  Chars  Filename
---------------------------
   35    531  plan9-cat.c
   48    955  busybox-cat.c
   48    986  inferno-cat.b
   63   1130  unix7-cat.c
   64    646  unix2-cat.s
   69   1241  unix10-cat.c
  222   3948  4.3bsd-cat.c
  316   6952  netbsd-cat.c
  782  22684  gnu-cat.c
 1647  39073  total

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cats's Issues

Encountered a reversible "cat -v"?

Hi!

I'm wondering if you've come across a cat implementation that produces cat -v output that can be uniquely reversed back to the original. It may not be a historical version, but if you have looked into these cats extensively, you may have come across this functionality.

I stumbled upon a project that did just that about a year or two ago, found it interesting, but despite repeatedly combing the web for this (by searching for terms like "invertible", "reversible", "bijective", etc), I can't seem to find it again. It may have been BSD based.

By cat -v, I mean at a high level turning unprintable characters into escaped ones, coded in ASCII. I often do just that, but it would be a nice plus to get back the original should I want it.

In plan9 cat is "argv0" correct?

In the plan9 version of cat, it has

argv0 = "cat";

but argv0 is never defined nor used for anything. Was this copied correctly from the source? I suspect it was supposed to be argv[0] to set the filename. (I don't have plan9 sources at hand to check)

pete / cats Goto Github PK

cats's Introduction

cats's People

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cats's Issues

Encountered a reversible "cat -v"?

In plan9 cat is "argv0" correct?

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