From: UnixOS2 Archive
To: "UnixOS2 Archive" <UnixOS2_Archive at unixos2.com>
Date: Mon, 24 Mar 2003 05:00:37 EST-10EDT,10,-1,0,7200,3,-1,0,7200,3600
Subject: [UnixOS2_Archive] No. 81

**************************************************
Sunday 23 March 2003
 Number  81
**************************************************

Subjects for today
 
1   FYI - Truncating logs. : Dave Saville" <dave.saville at ntlworld.com>
2  Re:  FYI - Truncating logs. : Steven Levine" <steve53 at earthlink.net>
3  Re:  FYI - Truncating logs. : Sebastian Wittmeier (ShadoW)" <Sebastian.Wittmeier at ginko.de>

**= Email   1 ==========================**

Date:  Mon, 24 Mar 2003 08:26:40 +0000 (GMT)
From:  "Dave Saville" <dave.saville at ntlworld.com>
Subject:   FYI - Truncating logs.

I have found out that it would appear to be OK on OS/2 to do the cat
</dev/null >some log Unix trick to truncate an open log. 

Unfortunately the cmd shell allows >nul but not <nul. I have tested
from the command line with cat - >log and given it a ^D and it seems
OK on the log files of various programs I have tested. Of course I
have no idea if those programs keep the file open all the time or
just when writing. I think I will put an empty file called /dev/null
on all drives and then look at adapting log cycling scripts from my
Unix box. I have a great one that you tell a) how many logs to keep
and b) how many of those should be compressed. So you could keep the
last two days readily readable and the rest zipped.

-- 
Regards

Dave Saville


**= Email   2 ==========================**

Date:  Mon, 24 Mar 2003 08:53:08 -0800
From:  "Steven Levine" <steve53 at earthlink.net>
Subject:  Re:  FYI - Truncating logs.

In <20030324082916.GKSX310.mta05-svc.ntlworld.com at pooh>, on 03/24/03 
   at 08:26 AM, "Dave Saville" <dave.saville at ntlworld.com> said:

>I have found out that it would appear to be OK on OS/2 to do the cat
></dev/null >some log Unix trick to truncate an open log. 

>Unfortunately the cmd shell allows >nul but not <nul. I have tested from
>the command line with cat - >log and given it a ^D and it seems OK on the

What shell are you using?  Some OS/2 shells are more brain dead than
others.  With 4OS2:

[d:\tmp\00instal]cat - </dev/nul >tmp.txt

[d:\tmp\00instal]cat tmp.txt

[d:\tmp\00instal]

Same for ksh.

Steven


-- 
---------------------------------------------------------------------
"Steven Levine" <steve53 at earthlink.net>  MR2/ICE 2.35 #10183 Warp4/FP15/14.085_W4
www.scoug.com irc.webbnet.org #scoug (Wed 7pm PST)
---------------------------------------------------------------------


**= Email   3 ==========================**

Date:  Mon, 24 Mar 2003 14:04:00 +0100 (CET)
From:  "Sebastian Wittmeier (ShadoW)" <Sebastian.Wittmeier at ginko.de>
Subject:  Re:  FYI - Truncating logs.

On Mon, 24 Mar 2003 08:26:40 +0000 (GMT), Dave Saville wrote:

>I have found out that it would appear to be OK on OS/2 to do the cat
></dev/null >some log Unix trick to truncate an open log. 

OS/2 handles open files differently than Unix operating systems (e.g.
you can't delete them).
Thus I'm amazed that your ^D trick works the same way.

Would you mind explaining the matter for interest?

Sebastian