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Full Discussion: How to stop debug in the mid of process?
Top Forums UNIX for Dummies Questions & Answers How to stop debug in the mid of process? Post 302871831 by bakunin on Thursday 7th of November 2013 04:33:53 AM
Old 11-07-2013
Don has it - as always - right: instead of tracing the script wholesale you should trace one (small) piece after the other. Set pairs of set -xv and set +xv and move these pairs around while debugging.

Another thing is: debugging output happens on <stderr> and you can catch this output and display it pagewise:

Code:
/your/script_with_tracing.sh 2>&1 | more

My favourite is yet to (mostly) skip tracing altogether. In most cases you can put in some diagnostic messages into your script. Suppose you have the following:

Code:
while [ $value != something ] ; do
     command1
     command2
     value=$(some_command giving some value)
     command3
done

Instead of decorating such a loop with "set +/- xv" you could also build in a diagnostic message and let it run:

Code:
while [ $value != something ] ; do
     command1
     command2

     echo "old value is $value"
     value=$(some_command giving some value)
     echo "new value is $value"
    
     command3
done

Now you will get pairs of before- and after-values and can probably find the culprit. Maybe there is another component involved, so output that too with each pass of the loop. You get the idea.

Once you found and corrected the problem you remove these lines again and start working on the next bug the same way.

Another possibility is to display commands instead of executing them. Replace any:

Code:
problematic_command $value1 $value2

with

Code:
DEBUG="echo "       # somewhere at the beginning of execution

...

$DEBUG problematic_command $value1 $value2

You can decorate several interesting commands like that. If you set DEBUG to "echo" they are not executed but displayed like they would be executed, quite similar to what you see with "set -x". Set DEBUG to "" and they are executed normally again. This way you can switch between debugging runs and normal runs easily.

I hope this helps.

bakunin
 

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LEARN ABOUT SUSE

calibre-debug

CALIBRE-DEBUG(1)						      calibre							  CALIBRE-DEBUG(1)

NAME

       calibre-debug - part of calibre

SYNOPSIS

       calibre-debug  [options]

DESCRIPTION

       Run an embedded python interpreter.

       Whenever you pass arguments to calibre-debug that have spaces in them, enclose the arguments in quotation marks.

OPTIONS

       --version
	      show program's version number and exit

       -h, --help
	      show this help message and exit

       -c, --command
	      Run python code.

       -e, --exec-file
	      Run the python code in file.

       -d, --debug-device-driver
	      Debug the specified device driver.

       -g, --gui
	      Run the GUI

       -w, --viewer
	      Run the ebook viewer

       --paths
	      Output the paths necessary to setup the calibre environment

       --migrate
	      Migrate old database. Needs two arguments. Path to library1.db and path to new library folder.

       --add-simple-plugin
	      Add  a  simple  plugin (i.e. a plugin that consists of only a .py file), by specifying the path to the py file containing the plugin
	      code.

       --reinitialize-db
	      Re-initialize the sqlite calibre database at the specified path. Useful to recover from db corruption.

SEE ALSO

       The User Manual is available at http://calibre-ebook.com/user_manual

       Created by Kovid Goyal <kovid@kovidgoyal.net>

calibre-debug (calibre 0.6.53)					     July 2010							  CALIBRE-DEBUG(1)
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