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RE: Control characters getting displayed in log



Using strings command you would be able to remove special characters
from the file..



Thanks,
Krishnaprasad

-----Original Message-----
From: redhat-list-bounces redhat com
[mailto:redhat-list-bounces redhat com] On Behalf Of Sadashiv Kulthe
Sent: Thursday, December 13, 2007 4:58 PM
To: redhat-list redhat com
Subject: Control characters getting displayed in log

Hi,

I am using redhat servers and have lot modification in installation
process
for application.

It asks many questions on command prompt and take input from user.

Reasons why control characters getting logged into logs are -

1. Script has a text-based menu-oriented UI, which uses control
sequences to
move the cursor around the screen, change the color of the text, etc.
Therefore, the logged output contains control characters.

2. The message of a  install contains a Ctrl-G character to sound the
console bell/beeper (presumably to get the attention of whoever was
performing the installation).  That character is also logged to
/var/log/messages.

3. Messages from Linux RC scripts often contain control sequences to
print
their status in either green (success) or red (failure).  These messages
may
be logged to /var/log/messages.


*I want to avoid control characters getting logged into logs. How can I
do
this?*

Control characters looks like

Nov 29 14:25:48 localhostconfig: ^[6 ^[6^[[1;1H
Nov 29 14:25:50 localhost config:
^[[6;11H^[[0m^[[30m^[[47m+^[[30m^[[47m--------------^[[0m^[[30m^[[47m+
^[[31m
^[[30m
+^[[30m^[[47m---------------^[[0m^[[30m^[[47m+^[[7;11H|
|^[[1m^[[37m^[[40m ^[[8;11H^[[0m^[[30m^[[47m|
           |^[[1m^[[37m^[[40m
^[[9;11H^[[0m^[[30m^[[47m|
|^[[1m^[[37m^[[40m ^[[10;11H^[[0m^[[30m^[[47m|
 Station on   |^[[1m^[[37m^[[40m ^[[11;11H^[[0m^[[30m^[[47m| an already
installed and running
      |^[[1m^[[37m^[[40m
^[[12;11H^[[0m^[[30m^[[47m|
|^[[1m^[[37m^[[40m
^[[13;11H^[[0m^[[30m^[[47m|
|^[[1m^[[37m^[[40m ^[[14;11H^[[0m^[[30m^[[47m|
^[[37m^[[41m+-----+^[[30m^[[47m
^[[37m^[[41m+----+^[[30m^[[47m            |^[[1m^[[37m^[[40m
^[[15;11H^[[0m^[[30m^[[47m|          ^[[37m^[[41m|^[[31m^[[47m Yes
Nov 29 14:26:10 localhost  : ^[[14;22H^[[0m^[[30m^[[47m       ^[[15;22H
^[[37m^[[41m+-----+^[[16;22H^[[30m^[[47m ^[[37m^[[41m|^[[31m^[[47m Yes
^[[37m^[[41m|^[[17;23H+-----+^[[16;29H

Regards,
Sadashiv Kulthe
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