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Full Discussion: "sed" to check file size & echo " " to destination file
Top Forums Shell Programming and Scripting "sed" to check file size & echo " " to destination file Post 302145265 by jockey007 on Tuesday 13th of November 2007 02:46:40 PM
Old 11-13-2007
"sed" to check file size & echo " " to destination file
Hi,

I've modified the syslogd source to include a thread that will keep track of a timer(or a timer thread). My intention is to check the file size of /var/log/messages in every one minute & if the size is more than 128KB, do a echo " " > /var/log/messages, so that the file size will be set back to zero.
If somebody can help me with a sed command to check the size of messages & to do a echo "" > messages ,if the size is greater than 128KB, I'll really grateful.

Wishes
Jay
Last edited by jockey007; 11-13-2007 at 03:47 PM.. Reason: typo
 

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LEARN ABOUT OSF1

strerr

strerr(8)						      System Manager's Manual							 strerr(8)

NAME

       strerr - Receives error messages from the STREAMS log driver

SYNOPSIS

       /usr/sbin/strerr [-a sys_admin_mail_name] [-d logdir]

PARAMETERS

       Specifies the mail name of the user to receive the message via mail.  This is the system administrator by default.  Specifies the directory
       to contain the error log file.  This is /var/adm/streams by default.

DESCRIPTION

       The strerr daemon receives error messages from the STREAMS log driver (strlog) for addition to the STREAMS error log files (error.mm.dd) in
       the  STREAMS  error logger directory (/var/adm/streams by default).  When first called, the strerr daemon creates the log file error.mm.dd.
       This is a daily log file, where mm indicates the month and dd indicates the day of the logged messages.	The  strerr  daemon  then  appends
       each error message that it subsequently receives from the STREAMS log driver to the log file.

       STREAMS	error  log  messages  have  the  following format: seq_num  std_time  ticks_time  flags  mod_ID  sub_ID  msg_text where: The error
       sequence number.  The time the message was sent, in the format hh:mm:ss.  The time the message was sent, measured in  machine  ticks  since
       the  last  boot.  Can be any of the following indicators: Indicates that the message has also been saved in the process's trace log.  Indi-
       cates that the message signaled a fatal error.  Indicates that the message is to be sent to the system administrator or specified user  via
       mail.   The module identification number of the trace message source.  The subidentification number of the trace message source.  The trace
       message text.

       The strerr daemon will run continuously until terminated by the user.

FILES

       The error log file or files on which strerr operates.

NOTES

       Only one strerr process can open the STREAMS log driver at a time.  This restriction is intended to maximize performance.

       The STREAMS error logging mechanism works best when it is not overused.	The strerr daemon can degrade STREAMS performance by affecting the
       response,  throughput,  and  other  behaviors  of the drivers and modules that invoke it.  The daemon will also fail to capture messages if
       drivers and modules generate messages at a higher rate than its optimum read rate.  Missing sequence numbers among the messages	in  a  log
       file indicate that messages have been lost.

RELATED INFORMATION

       Interfaces: strlog(7).  delim off

																	 strerr(8)
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