script help

linuxnube · 02-05-2004, 08:29 AM

I have several shell scripts which are sending errors to stderr. Is there anyway to have the line in the script echo the command to stdout as it is running in order to determine what is failing?

How does one see 'into' a running script - or can one step through a script?

Thanks!

LinuxLala · 02-05-2004, 09:38 AM

I'd say that you will find better answers in the Programming forum.

Report this thread to a moderator(click on the Report this post to a moderator link on the bottom right of your post) and ask him to move the thread to the programming forum)

Cheers.

/bin/bash · 02-05-2004, 10:43 AM

Normaly stderr would go to the console, so you probably have a line in the script that is sending it to /dev/null. This is common with dameons.

From the Advanced Bash-Scripting Guide.

Code:

   1>filename
      # Redirect stdout to file "filename".
   1>>filename
      # Redirect and append stdout to file "filename".
   2>filename
      # Redirect stderr to file "filename".
   2>>filename
      # Redirect and append stderr to file "filename".
   &>filename
      # Redirect both stdout and stderr to file "filename".

So look for a line like this and comment it out, then you should see the errors.
COMMAND THAT FAILS &> /dev/null
COMMAND THAT FAILS # &> /dev/null

trickykid · 02-05-2004, 10:45 AM

Moved: User Request

linuxnube · 02-05-2004, 11:49 AM

Actually, I am seeing the errors and not the lines that cause them. I was hoping there was a way see:

command line of script
results/error of line of script

command line of script
results/error of line of script

command line of script
results/error of line of script

Any hope?

markjuggles · 02-05-2004, 12:27 PM

Hi,

Try running your script from an explicit shell using the -x option:

$ bash -x my_script

Mark

linuxnube · 02-05-2004, 02:49 PM

Thanks - just what I was looking for.