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Full Discussion: how to delete core file (file created due to apps crashed)
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
Old 04-05-2011
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 NETBSD

fincore

FINCORE(1)						    BSD General Commands Manual 						FINCORE(1)

NAME

     fincore -- query in-core status of file pages

SYNOPSIS

     fincore [-qs] file ...

DESCRIPTION

     The fincore utility queries and displays in-core status of specified files.

     Note that the result can already be stale when being output due to other activities in the system.  Thus it should be used only for advisory
     purposes.

     The fincore utility accepts the following options.

     -q        The quiet mode.	Outputs nothing unless the file has in-core pages.

     -s        The summary mode.  Only shows number of pages.

EXAMPLES

     The following example shows that /bin/cat and /bin/cp are fully cached in-core while the other executables are not in-core.  numbers shown in
     the default output are page indexes in the file of each in-core pages.

     % fincore /bin/c*
     /bin/cat: 0 1 2 3
     /bin/chio:
     /bin/chmod:
     /bin/cp: 0 1 2 3 4 5
     /bin/cpio:
     /bin/csh:
     % fincore -s /bin/c*
     /bin/cat: 4 / 4 in-core pages (100.00%)
     /bin/chio: 0 / 5 in-core pages (0.00%)
     /bin/chmod: 0 / 3 in-core pages (0.00%)
     /bin/cp: 6 / 6 in-core pages (100.00%)
     /bin/cpio: 0 / 36 in-core pages (0.00%)
     /bin/csh: 0 / 41 in-core pages (0.00%)

SEE ALSO

     mincore(2)

AUTHORS

     The fincore utility is written by YAMAMOTO Takashi.

CAVEATS

     The concept of page cache is an implementation detail of the kernel.  The fincore utility works using some assumptions on the current imple-
     mentation.  Thus it might stop working in a future version of NetBSD.

BUGS

     The amount of CPU time the current implementation of fincore utility would take is roughly proportional to the file sizes.  Ideally it should
     be proportional to the number of in-core pages.

BSD
								  January 5, 2012							       BSD
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