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Shell Programming and Scripting
How to redirect stderr for <file if file does not exist?
Post 302912398 by Chubler_XL on Thursday 7th of August 2014 09:48:02 PM
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redirecting STDOUT & STDERR to file is quite simple, I'm currently using:
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LEARN ABOUT CENTOS
pmdaopenlog
PMDAOPENLOG(3) Library Functions Manual PMDAOPENLOG(3) NAME
pmdaOpenLog - redirect stderr to a logfile C SYNOPSIS
#include <pcp/pmapi.h> #include <pcp/impl.h> #include <pcp/pmda.h> void pmdaOpenLog(pmdaInterface * dispatch); cc ... -lpcp_pmda -lpcp DESCRIPTION
pmdaOpenLog redirects stderr to the logfile specified in the dispatch structure, set by the previous call to pmdaDaemon(3) or pmdaGe- tOpt(3). The first line of the log file will detail the name of the calling process, the host the process is running on, and the current time. In addition, the log is appended with the exit time of the process by a routine registered with atexit(3C). CAVEAT
The PMDA must be using PMDA_PROTOCOL_2 or later, as specified in the call to pmdaDSO(3) or pmdaDaemon(3). PCP ENVIRONMENT
Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP. On each installation, the file /etc/pcp.conf contains the local values for these variables. The $PCP_CONF variable may be used to specify an alternative configura- tion file, as described in pcp.conf(5). Values for these variables may be obtained programmatically using the pmGetConfig(3) function. SEE ALSO
pmcd(1), atexit(2), PMAPI(3), PMDA(3), pmdaDaemon(3) and pmdaGetOpt(3). Performance Co-Pilot PCP PMDAOPENLOG(3)