how to delete core file (file created due to apps crashed) Post: 302510963

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Homework and Emergencies Homework & Coursework Questions how to delete core file (file created due to apps crashed) Post 302510963 by methyl on Tuesday 5th of April 2011 11:25:09 AM

04-05-2011

Registered User

Quote:

find . -name core | xargs file | grep "core file" | sed -e ’s/^.*from\ //’ -e s/\’//g

The above command also gives the signal which triggered the core dump.
Examples from my unix system:

Quote:

rm - received SIGQUIT
sh - received SIGSEGV
stty - received SIGQUIT

Try it on your course sample core files and see what output you get.

I guess that the "sed" can be adjusted to just give the name of the program which caused the core dump. Then it is a case of finding out if the command is in your current path (possibly with the "whence" command but it depends on what Shell you are using).

Be careful. There is a trick in these instructions. If you only use the supplied command you will never find out the name of the core file and therefore not be able to delete the file. Be careful that you don't end up deleting the program which caused the core dump rather than the core dump itself.

Hint: Try the supplied command without the "sed", then consider how to extract the core file name and the name of the command which caused the core dump.

More hint: When you try with filenames like "core*" in the root partition make sure that your "find" includes "-type f" and that you correctly identify a file as a core dump. Many systems include a directory called "core" and most have "man" pages related to "core" - all of which are files which you definitely don't want to delete.

Last edited by methyl; 04-05-2011 at 12:39 PM..

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LEARN ABOUT BSD

gcore

GCORE(1)						      General Commands Manual							  GCORE(1)

NAME

       gcore - get core image of running process

SYNOPSIS

       gcore [-s][-c core] pid

DESCRIPTION

       gcore  creates  a  core	image  of  each specified process, suitable for use with adb(1).  By default the core image is written to the file
       <pid>.core.

       The options are:

       -c     Write the core file to the specified file instead of <pid>.core.

       -s     Stop the process while creating the core image and resume it when done.  This makes sure that the core dump will be in a	consistent
	      state.   The  process is resumed even if it was already stopped.	Of course, you can obtain the same result by manually stopping the
	      process with kill(1).

       The core image name was changed from core.<pid> to <pid>.core to prevent matching names like core.h and core.c when using programs such	as
       find(1).

FILES

       <process-id>.core   The core image.

BUGS

       If gcore encounters an error while creating the core image and the -s option was used the process will remain stopped.

       Swapped out processes and system processes (the swapper) may not be gcore'd.

4.2 Berkeley Distribution					  April 15, 1994							  GCORE(1)

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