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Full Discussion: Pick one file from each subdirectory
Top Forums Shell Programming and Scripting Pick one file from each subdirectory Post 302491581 by majest on Thursday 27th of January 2011 08:02:28 PM
Old 01-27-2011
Pick one file from each subdirectory
Hi, I have a problem I am trying to solve with bash.

I need to search in a file system (data base) with hundreds of directories and thousands of subdirectories and millions of files. The files have a specific format with a header that gives the properties. Directories are organized so subdirectores have some identical header properties, thus you can rule out a whole directory by testing a single file.

My plan was to get one file from every single subdirectory and test its header. However I can't think of a neat way to do it. The bash command DIRS=`find . -mindepth 3 -maxdepth 3 -type d` and then looping over $DIRS with the ls command is effective but requires an ls command on every single subdirectory..

I was wondering if there is a way to pick any file from $DIR without doing the ls?

Thanks!
 

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LEARN ABOUT V7

depmod.d

DEPMOD.D(5)							     depmod.d							       DEPMOD.D(5)

NAME

       depmod.d - Configuration directory for depmod

SYNOPSIS

       /usr/lib/depmod.d/*.conf

       /etc/depmod.d/*.conf

       /run/depmod.d/*.conf

DESCRIPTION

       The order in which modules are processed by the depmod command can be altered on a global or per-module basis. This is typically useful in
       cases where built-in kernel modules are complemented by custom built versions of the same and the user wishes to affect the priority of
       processing in order to override the module version supplied by the kernel.

       The format of files under depmod.d is simple: one command per line, with blank lines and lines starting with '#' ignored (useful for adding
       comments). A '' at the end of a line causes it to continue on the next line, which makes the files a bit neater.

COMMANDS

       search subdirectory...
	   This allows you to specify the order in which /lib/modules (or other configured module location) subdirectories will be processed by
	   depmod. Directories are listed in order, with the highest priority given to the first listed directory and the lowest priority given to
	   the last directory listed. The special keyword built-in refers to the standard module directories installed by the kernel.

	   By default, depmod will give a higher priority to a directory with the name updates using this built-in search string: "updates
	   built-in" but more complex arrangements are possible and are used in several popular distributions.

       override modulename kernelversion modulesubdirectory
	   This command allows you to override which version of a specific module will be used when more than one module sharing the same name is
	   processed by the depmod command. It is possible to specify one kernel or all kernels using the * wildcard.  modulesubdirectory is the
	   name of the subdirectory under /lib/modules (or other module location) where the target module is installed.

	   For example, it is possible to override the priority of an updated test module called kmod by specifying the following command:
	   "override kmod * extra". This will ensure that any matching module name installed under the extra subdirectory within /lib/modules (or
	   other module location) will take priority over any likenamed module already provided by the kernel.

COPYRIGHT

       This manual page Copyright 2006-2010, Jon Masters, Red Hat, Inc.

SEE ALSO

       depmod(8)

AUTHORS

       Jon Masters <jcm@jonmasters.org>
	   Developer

       Robby Workman <rworkman@slackware.com>
	   Developer

       Lucas De Marchi <lucas.de.marchi@gmail.com>
	   Developer

kmod								    01/28/2018							       DEPMOD.D(5)
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