03-19-2010
Hi:
Your code redirects stderr for the function to set.log2, so that's where all the trace output will be found. If the calling script is only reading stdout (from a pipe or coprocesses or fifo), you don't need that redirection.
Quote:
-x
The shell shall write to standard error a trace for each command after it expands the command and before it executes it. It is unspecified whether the command that turns tracing off is traced.
--
Shell Command Language
Regards,
Alister
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LEARN ABOUT DEBIAN
log::tracemessages
TraceMessages(3pm) User Contributed Perl Documentation TraceMessages(3pm)
NAME
Log::TraceMessages - Perl extension for trace messages used in debugging
SYNOPSIS
use Log::TraceMessages qw(t d);
$Log::TraceMessages::On = 1;
t 'got to here';
t 'value of $a is ' . d($a);
{
local $Log::TraceMessages::On = 0;
t 'this message will not be printed';
}
$Log::TraceMessages::Logfile = 'log.out';
t 'this message will go to the file log.out';
$Log::TraceMessages::Logfile = undef;
t 'and this message is on stderr as usual';
# For a CGI program producing HTML
$Log::TraceMessages::CGI = 1;
# Or to turn on trace if there's a command-line argument '--trace'
Log::TraceMessages::check_argv();
DESCRIPTION
This module is a slightly better way to put trace statements into your code than just calling print(). It provides an easy way to turn
trace on and off for particular sections of code without having to comment out bits of source.
USAGE
$Log::TraceMessages::On
Flag controlling whether tracing is on or off. You can set it as you wish, and of course it can be "local"-ized. The default is off.
$Log::TraceMessages::Logfile
The name of the file to which trace should be appended. If this is undefined (which is the default), then trace will be written to
stderr, or to stdout if $CGI is set.
$Log::TraceMessages::CGI
Flag controlling whether the program printing trace messages is a CGI program (default is no). This means that trace messages will be
printed as HTML. Unless $Logfile is also set, messages will be printed to stdout so they appear in the output page.
t(messages)
Print the given strings, if tracing is enabled. Unless $CGI is true or $Logfile is set, each message will be printed to stderr with a
newline appended.
trace(messages)
Synonym for "t(messages)".
d(scalar)
Return a string representation of a scalar's value suitable for use in a trace statement. This is just a wrapper for Data::Dumper.
"d()" will exit with '' if trace is not turned on. This is to stop your program being slowed down by generating lots of strings for
trace statements that are never printed.
dmp(scalar)
Synonym for "d(scalar)".
check_argv()
Looks at the global @ARGV of command-line parameters to find one called '--trace'. If this is found, it will be removed from @ARGV and
tracing will be turned on. Since tracing is off by default, calling "check_argv()" is a way to make your program print trace only when
you ask for it from the command line.
AUTHOR
Ed Avis, ed@membled.com
SEE ALSO
perl(1), Data::Dumper(3).
perl v5.8.8 2006-05-27 TraceMessages(3pm)