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Full Discussion: Stack Trace
Top Forums Shell Programming and Scripting Stack Trace Post 302817371 by DGPickett on Wednesday 5th of June 2013 04:05:39 PM
Old 06-05-2013
You lack an unpush if things go ok in the first leven N function and bad in the second level N function. You might put the message on the end of an exported env. variable in a subshell, so when you return it removes your addition.
Code:
#!/usr/bin/ksh
xxx(){
 ( a=$a/xxx 
 return 1 )
  return $!
}
a=
xxx
echo "xxx returns $?
a='$a'"
~
~
~
~
~
~
~
~
~
"funcewrite" 15 lines, 102 characters 
$ funcewrite    
xxx returns 1
a=''
$

This is much nicer in JAVA/C++ (Abstract Class method inheritance)! I wrote a similar bit for XML schema parse, where the containing element could call its parent first to print out his path, which rippled up to root where it started printing because there was no parent and then unrolled back printing each level to the original caller to print his bit last.
 

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LEARN ABOUT DEBIAN

guards

GUARDS(1)						User Contributed Perl Documentation						 GUARDS(1)

NAME

       guards - select from a list of files guarded by conditions

SYNOPSIS

       guards [--prefix=dir] [--path=dir2:dir2:...] [--default=0|1]	   [-v|--invert-match] [--list|--check] [--config=file]        symbol ...

DESCRIPTION

       The script reads a configuration file that may contain so-called guards, file names, and comments, and writes those file names that satisfy
       all guards to standard output. The script takes a list of symbols as its arguments. Each line in the configuration file is processed
       separately. Lines may start with a number of guards. The following guards are defined:

	   +xxx Include the file(s) on this line if the symbol xxx is defined.

	   -xxx Exclude the file(s) on this line if the symbol xxx is defined.

	   +!xxx Include the file(s) on this line if the symbol xxx is not defined.

	   -!xxx Exclude the file(s) on this line if the symbol xxx is not defined.

	   - Exclude this file. Used to avoid spurious --check messages.

       The guards are processed left to right. The last guard that matches determines if the file is included. If no guard is specified, the
       --default setting determines if the file is included.

       If no configuration file is specified, the script reads from standard input.

       The --check option is used to compare the specification file against the file system. If files are referenced in the specification that do
       not exist, or if files are not enlisted in the specification file warnings are printed. The --path option can be used to specify which
       directory or directories to scan.  Multiple directories are separated by a colon (":") character. The --prefix option specifies the
       location of the files.

AUTHOR

       Andreas Gruenbacher <agruen@suse.de> (SuSE Linux AG)

perl v5.14.2							    2012-03-04								 GUARDS(1)
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