creating a directory tree Post: 302360015

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Top Forums Shell Programming and Scripting creating a directory tree Post 302360015 by Scrutinizer on Thursday 8th of October 2009 03:10:25 AM

10-08-2009

Moderator

Hi NBaH,

When cooking something recursive I think there are two essential ingredients:

local variables ( "typeset var" )
variable passing

There are multiple functions active at the same time and their variables should not interfere with parent's variables. To make a distinction between local and global variables I used lower case and upper case. Also there was a while loop in the generate function that should be an if statement.

Code:

#!/bin/bash
#set -x

read -p " What root directory? " ROOTDIR
[ -d $ROOTDIR ] && { /bin/rm -R $ROOTDIR; mkdir $ROOTDIR; } || mkdir $ROOTDIR
read -p " How many directories? " DIRNB
read -p " How many levels? " LEVNB

generate() {
   typeset path=$1
   typeset level=$2
   typeset directory
   typeset n
   ((level++))
   for (( n=0; n < ${DIRNB:-1}; n++ )); do
      mkdir $path/directory$n
   done
   if [ $level -lt ${LEVNB:-1} ]; then
      for directory in $path/*; do
         generate $directory $level
      done
   fi
}
LEVEL=0
generate $ROOTDIR $LEVEL
find $ROOTDIR

---------- Post updated at 11:10 PM ---------- Previous update was at 10:33 PM ----------

Also, if you move the creation of the topdir at each level to the function, you can make it a bit shorter:

Code:

#!/bin/bash

read -p " What root directory?     " ROOTDIR
read -p " How many subdirectories? " SUBDIRS
read -p " How many levels?         " LEVELS
if [ -d $ROOTDIR ]; then
  echo $ROOTDIR exist
  exit 1
fi

generate() {
   typeset path=$1
   typeset level=$2
   typeset n
   mkdir $path
   if (( level > 0 )); then
     for (( n=0; n < SUBDIRS; n++ )); do
        generate $path/directory$n $((level-1))
     done
   fi
}

generate $ROOTDIR $LEVELS
find $ROOTDIR

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LEARN ABOUT OPENDARWIN

mkzftree

MKZFTREE(1)							  H. Peter Anvin						       MKZFTREE(1)

NAME

       mkzftree - Create a zisofs/RockRidge compressed file tree

SYNOPSIS

       mkzftree [OPTIONS]... INPUT OUTPUT

DESCRIPTION

       Takes  an  input  file tree (INPUT) and create a corresponding compressed file tree (OUTPUT) that can be used with an appropriately patched
       mkisofs(8) to create a transparent-compression ISO 9660/Rock Ridge filesystem using the "ZF" compression records.

OPTIONS

       -f, --force
	      Always compress all files, even if they get larger when compressed.

       -z level, --level level
	      Select compression level (1-9, default is 9).  Lower compression levels are faster, but typically result in larger output.

       -u, --uncompress
	      Uncompress an already compressed tree.  This can be used to read a  compressed  filesystem  on  a  system  which	cannot	read  them
	      natively.

       -p parallelism, --parallelism parallelism
	      Compress in parallel.  The parallelism value indicates how many compression threads are allowed to run.

       -x, --one-filesystem
	      Do not cross filesystem boundaries, but create directory stubs at mount points.

       -X, --strict-one-filesystem
	      Do not cross filesystem boundaries, and do not create directory stubs at mount points.

       -C path, --crib-path path
	      Steal ("crib") files from another directory if it looks (based on name, size, type and modification time) like they match entries in
	      the new filesystem.  The "crib tree" is usually the compressed version of an older version of the same workload;	this  thus  allows
	      for  "incremental  rebuilds" of a compressed filesystem tree.  The files are hardlinked from the crib tree to the output tree, so if
	      it is desirable to keep the link count correct the crib path should be deleted before running mkisofs.  The crib tree must be on the
	      same filesystem as the output tree.

       -l, --local
	      Do not recurse into subdirectories, but create the directories themselves.

       -L, --strict-local
	      Do not recurse into subdirectories, and do not create directories.

       -F, --file
	      Indicates  that  INPUT  may  not	necessarily be a directory; this allows operation on a single file.  Note especially that if -F is
	      specified, and INPUT is a symlink, the symlink itself will be copied rather than whatever it happens to point to.

       -s, --sloppy
	      Treat file modes, times and ownership data as less than precious information and don't abort if they cannot be  set.   This  may	be
	      useful if running mkisofs on an input tree you do not own.

       -v, --verbose
	      Increase the program verbosity.

       -V value, --verbosity value
	      Set the program verbosity to value.

       -q, --quiet
	      Issue no messages whatsoever, including error messages.  This is the same as specifying -V 0.

       -h, --help
	      Display a brief help message.

       -w, --version
	      Display the release version.

BUGS

       Long  options  (beginning  with --) may not work on all systems.  See the message printed out by mkzftree -h to see if this applies to your
       system.

       Inode change times (ctimes) are not copied.  This is a system limitation and applies to all file copy programs.

       If using the parallel option (-z) the access times (atimes) on directories may or may not be copied.  If it is important that the atimes on
       directories are copied exactly, avoid using -z.

AUTHOR

       Written by H. Peter Anvin <hpa@zytor.com>.

COPYRIGHT

       Copyright (C) 2001-2002 H. Peter Anvin.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       mkisofs(8)

zisofs-tools							   30 July 2001 						       MKZFTREE(1)

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