RE: Command history is no longer functioning....

[Miquel Cabanas]

there should be one last instance of octave_hist right at the end of the
trace file,

  open("/home/miquel/.octave_hist", O_WRONLY|O_CREAT|O_TRUNC, 0600) = 3
  write(3, "path\nhelp path\nloadpath\nhelp loa"..., 6596) = 6596
  close(3)                                = 0
  munmap(0x40e9d000, 4096)                = 0
  exit_group(0)                           = ?

this one corresponding to the rewriting of octave_hist just before
octave quit (munmap and exit_group).

Miquel

On Wed, 2006-04-05 at 16:54 +0200, Miquel Cabanas wrote:
> ough!
> 
> can you run octave from strace and save the execution trace to a file?
> then you could check what's doing octave behind the scene. For instance,
> 
> > strace -o octave.trace.output octave
> 
> once inside octave just type a couple of commands (eg history and clear)
> and exit. Then you can examine the content of "octave.trace.output" with
> a text editor,
> 
> 1. search for readline and make sure octave finds a readline library
> file. For instance, Octave failed to find this library,
> 
>   open("/usr/lib/octave-2.1.69/libreadline.so.5", O_RDONLY) = -1
>     ENOENT   (No such file or directory)
> 
> but found this other one,
> 
>   open("/lib/libreadline.so.5", O_RDONLY) = 3
> 
> 2. search for "octave_hist" and verify whether octave finds and opens it
> to read the history of commands when starting,
> 
>   open("/home/miquel/.octave_hist", O_RDONLY) = 3
>   fstat64(3, {st_mode=S_IFREG|0600, st_size=6583, ...}) = 0
>   read(3, "path\nhelp path\nloadpath\nhelp loa"..., 6583) = 6583
>   close(3)                                = 0
> 
> 3. then, move to the end of the trace file, and try finding a set of
> lines like,
> 
>   fcntl64(4, F_GETFL)                     = 0x1 (flags O_WRONLY)
>   fstat64(4, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
>     old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|
>     MAP_ANONYMOUS, -1, 0) = 0x40e9e000
>   _llseek(4, 0, 0xbfffe804, SEEK_CUR)     = -1 ESPIPE (Illegal seek)
>   write(4, "    1 path\n    2 help path\n    3"..., 8192) = 8192
>   write(4, "ary\n", 4)                    = 4
>   write(4, "  396 diary on\n", 15)        = 15
>   write(4, "  397 whos\n", 11)            = 11
>   ...
>   write(4, "  469 history\n", 14)         = 14
>   close(4)                                = 0
> 
> which indicate that octave is writing the history of commands to the
> history file. The last commands should be the ones you typed inside your
> octave session.
> 
> Miquel
> 
> On Wed, 2006-04-05 at 15:26 +0100, Bernard Siow wrote:
> > No mention of history_size or history_file in either user or shared
> > config files 
> > 
> > -----Original Message-----
> > From: Miquel Cabanas [mailto:address@hidden 
> > Sent: 05 April 2006 15:12
> > To: Bernard Siow
> > Cc: address@hidden
> > Subject: RE: Command history is no longer functioning....
> > 
> > which is the value of history_size within Octave?
> > 
> > octave:1> history_size
> > history_size = 1024
> > 
> > if it is not 1024, check whether it's been assigned a new value in your
> > local ~/.octaverc or in the wide-system /etc/octave/octave*.conf
> > 
> > check also the history_file variable,
> > 
> > octave:2> history_file
> > history_file = /home/miquel/.octave_hist
> > 
> > Miquel
> > 
> > On Wed, 2006-04-05 at 14:57 +0100, Bernard Siow wrote:
> > > Thanks for the reply, I do have rw permission on the file and command 
> > > history is still not working!
> > > 
> > > -----Original Message-----
> > > From: Miquel Cabanas [mailto:address@hidden
> > > Sent: 05 April 2006 14:55
> > > To: Bernard Siow
> > > Cc: address@hidden
> > > Subject: Re: Command history is no longer functioning....
> > > 
> > > one possibility is that you have changed the file permissions of 
> > > ".octave_hist" at your home directory,
> > > 
> > > $ ls -l .octave_hist
> > > -rw-------  1 miquel miquel 6470 2006-04-05 09:25 .octave_hist
> > > 
> > > you must have write permission to append new commands to this file.
> > 
> > 



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