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Full Discussion: Tracing a function call
Top Forums Shell Programming and Scripting Tracing a function call Post 302405700 by steadyonabix on Friday 19th of March 2010 03:27:42 PM
Old 03-19-2010
Tracing a function call
Hi

I am hoping someone can explain this to me as I am struggling to understand it.

I had a problem today with needing to trace a ksh script that was dotting in a function that was writing to stdout. The problem was it was being run in a sub shell and the output was being parsed by the calling script so I could not have any trace output on stdout.

On a hunch I tried this solution to log the function's trace to file and it worked but I don't know why, can anyone enlighten me?

The code: -

Code:
TX5XN:/home/brad/ksh_stuff>cat trace_2

func()
{
    set -x
    echo "This goes to stdout from func"
    set +x
    echo "=============================" >&2
} 2>> set.log2

echo "This goes to stdout from main body"

for x in 1 2 3 4 5
do
    func
done

The output to stdout: -

Code:
TX5XN:/home/brad/ksh_stuff> trace_2  
This goes to stdout from main body
This goes to stdout from func
This goes to stdout from func
This goes to stdout from func
This goes to stdout from func
This goes to stdout from func

The trace log: -

Code:
TX5XN:/home/brad/ksh_stuff>cat set.log2
trace_2:5-echo 'This goes to stdout from func'
=============================
trace_2:5-echo 'This goes to stdout from func'
=============================
trace_2:5-echo 'This goes to stdout from func'
=============================
trace_2:5-echo 'This goes to stdout from func'
=============================
trace_2:5-echo 'This goes to stdout from func'
=============================

 

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LEARN ABOUT DEBIAN

nifti_stats

NIFTI_STATS(1)							   User Commands						    NIFTI_STATS(1)

NAME

       nifti_stats - compute NIfTI statistical functions

SYNOPSIS

       nifti_stats [-q|-d|-1|-z] value CODE [p1 p2 p3]

DESCRIPTION

       nifti_stats  supports several distributions (normal, uniform, logistic, chi, etc.) and calculates density or cummulative distribution func-
       tion (and many more). Values are printed to stdout and can be piped to other tools.

       value can be a single number or in the form bot:top:step.
	      default ==> output p = Prob(statistic < val).

       -q     ==> output is 1-p.

       -d     ==> output is density.

       -1     ==> output is x such that Prob(statistic < x) = val.

       -z     ==> output is z such that Normal cdf(z) = p(val).

       -h     ==> output is z such that 1/2-Normal cdf(z) = p(val).

       Allowable CODEs:

       CORREL, TTEST, FTEST, ZSCORE, CHISQ, BETA, BINOM, GAMMA, POISSON, NORMAL, FTEST_NONC, CHISQ_NONC, LOGISTIC, LAPLACE,  UNIFORM,  TTEST_NONC,
       WEIBULL, CHI, INVGAUSS, EXTVAL, PVAL, LOGPVAL and LOG10PVAL

	      Following CODE are distributional parameters, as needed.

       Results are written to stdout, 1 number per output line.

EXAMPLE

       Piping output into AFNI program 1dplot:

	      nifti_stats -d 0:4:.001 INVGAUSS 1 3 | 1dplot -dx 0.001 -stdin

SEE ALSO

       libnifti(1), nifti_tool(1), nifti1_test(1).

       Homepage: http://niftilib.sourceforge.net

AUTHOR

       RW Cox - SSCC/NIMH/NIH/DHHS/USA/EARTH - March 2004

       This manual page was written by Michael Hanke <michael.hanke@gmail.com>, for the Debian project (but may be used by others).

nifti_stats							  September 2007						    NIFTI_STATS(1)
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