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Full Discussion: Redirecting STDERR to file and screen, STDOUT only to file
Top Forums Shell Programming and Scripting Redirecting STDERR to file and screen, STDOUT only to file Post 302698121 by bakunin on Saturday 8th of September 2012 06:29:58 AM
Old 09-08-2012
Fantastic! This is one of the threads that keep me coming here again and again.

When i wrote my first post i had the following script as data source for tests (AIX 6.1 last TL):

Code:
#! /bin/ksh

print -u1 "This goes to stdout."
print -u2 "This goes to stderr."

exit 0

I understand now why that worked with my redirections but in other more real-life situations they might fail.

My focus is on writing scripts to accomplish tasks and i want my own messages (error and warning/info) to be as tolerant as possible, so here is what i suggest as a solution for writing custom scripts:

- Put a time stamp in every line of output. Even if the lines in the output file will become disorganized, a simple "sort" will put them in order again. I use a certain "output format" for my lines, which is consistent across scripts:

[PID TIMESTAMP MSGCLASS message]

where MSGCLASS is either "Info", "Warning" or "Error".

- Work similar to "syslog": all (error/warning/info) messages to a info log, and error messages also to a separate error log. This way you can avoid the elaborate redirection gymnastics for the usual things you want to achieve.

I hope this helps.

bakunin
 

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LEARN ABOUT CENTOS

pmdarsyslog

PMDARSYSLOG(1)						       Performance Co-Pilot						    PMDARSYSLOG(1)

NAME

       pmdarsyslog - rsyslog (reliable and extended syslog) PMDA

DESCRIPTION

       pmdarsyslog is a Performance Metrics Domain Agent (PMDA) which exports metric values from the rsyslogd(8) server.  Further details about
       rsyslog can be found at http://www.rsyslog.com/.

INSTALLATION

       If you want access to the names and values for the rsyslog performance metrics, do the following as root:

	       # cd $PCP_PMDAS_DIR/rsyslog
	       # ./Install

       If you want to undo the installation, do the following as root:

	       # cd $PCP_PMDAS_DIR/rsyslog
	       # ./Remove

       pmdarsyslog is launched by pmcd(1) and should never be executed directly.  The Install and Remove scripts notify pmcd(1) when the agent is
       installed or removed.

       In order to use this agent, rsyslog stats gathering must be enabled.  This is done by adding the lines:

	       $ModLoad impstats
	       $PStatsInterval 5       # log every 5 seconds
	       syslog.info	       |/var/log/pcp/rsyslog/stats

       to your rsyslog.conf(5) configuration file after installing the PMDA.  Take care to ensure the syslog.info messages do not get logged in
       any other file, as this could unexpectedly fill your filesystem.  Syntax useful for this is syslog.!=info for explicitly excluding these.

FILES

       /var/log/pcp/rsyslog/stats
	   named pipe containing statistics exported from rsyslog, usually created by the PMDA Install script.

       $PCP_PMDAS_DIR/rsyslog/Install
	   installation script for the pmdarsyslog agent

       $PCP_PMDAS_DIR/rsyslog/Remove
	   undo installation script for the pmdarsyslog agent

       $PCP_LOG_DIR/pmcd/rsyslog.log
	   default log file for error messages from pmdarsyslog

SEE ALSO

       pmcd(1), rsyslog.conf(5), rsyslogd(8).

3.8.10							       Performance Co-Pilot						    PMDARSYSLOG(1)
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