Introduction

loginteractive is a small C hacks using LD_PRELOAD to be able to log interactive programs as if they where executed from a terminal.

Usage

You can use loginteractive as follows:

$ cat stdin.txt
A=rand(2,2)
v=eig(A)
$ env LD_PRELOAD=./loginteractive.so STDOUT=stdout.txt octave -qi < stdin.txt
>> A=rand(2,2)
A =
  0.86448  0.74905
  0.30702  0.50105

>> v=eig(A)
v =

  1.19560
  0.16994
$ cat stdout.txt 
>> A=rand(2,2)
A =

  0.86448  0.74905
  0.30702  0.50105

>> v=eig(A)
v =

  1.19560
  0.16994

$

The script runexamples.sh is included for demonstration.

There is an "undocumented feature" (pre-beta) to mimic the behavior of tail -f. Set the variable

static int g_follow = 1;

to enable this feature.

Known bugs

I have not tested loginteractive with anything else than GNU Octave, and Python. Ruby already has built-in support for interactive logging. Use irb --inspect < input > output and not loginteractive, as that will just mess it up. Please send bug reports to Henrik Holst.