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Full Discussion: Bash to verify and validate file header and data type
Top Forums Shell Programming and Scripting Bash to verify and validate file header and data type Post 302996008 by drl on Monday 17th of April 2017 08:45:54 AM
Old 04-17-2017
Hi.

Aside from the fact that the script has many lines, some of the lines are long. I tend to look at code if it fits within the width of a page, without me needing to scroll horizontally. Shells are very good at being able to continue pipelines. Other code can have lines terminated with \ to escape the newline. I think that aids comprehension and maintainability.

So without looking at your script in any detail, the next thing I would try is placing set -x in the script. You could also place intermediate printf/echo statements at crucial spots in your script. I use functions to turn on/off debugging output.

You could place set -x at the beginning to see everything. You could place it near the middle of the code, and then bisect the placement depending on whether you see something wrong or not.

Keep in mind that there could be more than error.

Best wishes ... cheers, drl
Last edited by drl; 04-17-2017 at 09:53 AM..
This User Gave Thanks to drl For This Post:
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LEARN ABOUT OSX

tcl_allowexceptions

Tcl_AllowExceptions(3)					      Tcl Library Procedures					    Tcl_AllowExceptions(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_AllowExceptions - allow all exceptions in next script evaluation

SYNOPSIS

       #include <tcl.h>

       Tcl_AllowExceptions(interp)

ARGUMENTS

       Tcl_Interp *interp (in)		Interpreter in which script will be evaluated.
_________________________________________________________________

DESCRIPTION

       If  a  script is evaluated at top-level (i.e. no other scripts are pending evaluation when the script is invoked), and if the script termi-
       nates with a completion code other than TCL_OK, TCL_ERROR or TCL_RETURN, then Tcl normally converts this into a TCL_ERROR  return  with	an
       appropriate  message.  The particular script evaluation procedures of Tcl that act in the manner are Tcl_EvalObjEx, Tcl_EvalObjv, Tcl_Eval,
       Tcl_EvalEx, Tcl_GlobalEval, Tcl_GlobalEvalObj, Tcl_VarEval and Tcl_VarEvalVA.

       However, if Tcl_AllowExceptions is invoked immediately before calling one of those a procedures, then arbitrary completion codes  are  per-
       mitted from the script, and they are returned without modification.  This is useful in cases where the caller can deal with exceptions such
       as TCL_BREAK or TCL_CONTINUE in a meaningful way.

KEYWORDS

       continue, break, exception, interpreter

Tcl									7.4						    Tcl_AllowExceptions(3)
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