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Full Discussion: how to check existance of multiple directories
Top Forums Shell Programming and Scripting how to check existance of multiple directories Post 302555330 by Corona688 on Wednesday 14th of September 2011 12:18:49 PM
Old 09-14-2011
&& doesn't work inside [ ].

Your logic is slightly off as well. If dir1 doesn't exist AND dir2 doesn't exist AND dir3 doesn't exist, it'll complain -- if only one or two are missing, it wouldn't.

Better logic would be, if dir1 exists AND dir2 exists AND dir3 exists, then everything's okay, otherwise, error.


Couple ways to do it.

Code:
function check_dirs1
{
        # && means 'if the first is okay, run the second'.  So if any of these don't exist,
        # the chain will stop and the function will return nonzero.
        [ -d dir1 ] && [ -d dir2 ] && [ -d dir3 ]
}

function check_dirs2
{
        # -a instead of && for [ ]
        [ -d dir1 -a -d dir2 -a -d dir3 ]
}

function check_dirs3
{
        # for bash/ksh, which has double-brackets [[ ]]
        [[ -d dir1 && -d dir2 && -d dir3 ]]
}

# If your expression is very large, you can break it into parts
function check_dirs4
{
        # || means, 'if the first thing doesn't succeed, run the second'.
        # So if dir1 doesn't exist, the function will return immediately
        # with a nonzero value.
        [ -d dir1 ] || return 1
        [ -d dir2 ] || return 1
        [ -d dir3 ] || return 1
        # once you're sure they all exist, return okay
        return 0
}

if ! check_dirs1
then
        echo "Required files not found in dirs1"
fi

if ! check_dirs2
then
        echo "Required files not found in dirs2"
fi

if ! check_dirs3
then
        echo "Required files not found in dirs3"
fi

if ! check_dirs4
then
        echo "Required files not found in dirs4"
fi

Last edited by Corona688; 09-14-2011 at 01:25 PM..
 

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LEARN ABOUT DEBIAN

mhddfs

mhddfs(1)						      General Commands Manual							 mhddfs(1)

NAME

       mhddfs - The driver combines a several mount points into the single one.

SYNOPSIS

	mhddfs /dir1,/dir2[,/path/to/dir3] /path/to/mount [-o options]
	mhddfs /dir1 dir2,dir3 /mount/point [-o options]
	...
	fusermount -u /path/to/mount

   fstab record example:
       mhddfs#/path/to/dir1,/path/to/dir2 /mnt/point fuse defaults 0 0

       mhddfs#/dir1,/dir2,/dir3 /mnt fuse logfile=/var/log/mhddfs.log 0 0

OPTIONS

       with an -o option1,option2...  you can specify some additional options:

   logfile=/path/to/file.log
       specify a file that will contain debug information.

   loglevel=x
       0 - debug messages

       1 - info messages

       2 - standard (default) messages

   mlimit=size[m|k|g]
       a  free space size threshold If a drive has the free space less than the threshold specifed then another drive will be choosen while creat-
       ing a new file.	If all the drives have free space less than the threshold specified then a  drive  containing  most  free  space  will	be
       choosen.

       Default value is 4G, minimum value is 100M.

       This option accepts suffixes:
	      [mM] - megabytes

	      [gG] - gigabytes

	      [kK] - kilobytes

       For an information about the additional options see output of:
	      mhddfs -h

DESCRIPTION

       The  file  system  allows to unite a several mount points (or directories) to the single one. So a one big filesystem is simulated and this
       makes it possible to combine a several hard drives or network file systems. This system is like unionfs but it can choose a drive with  the
       most of free space, and move the data between drives transparently for the applications.

       While writing files they are written to a 1st hdd until the hdd has the free space (see mlimit option), then they are written on a 2nd hdd,
       then to 3rd etc.

       df will show a total statistics of all filesystems like there is a big one hdd.

       If an overflow arises while writing to the hdd1 then a file content already written will be transferred to a hdd containing enough of  free
       space  for a file. The transferring is processed on-the-fly, fully transparent for the application that is writing. So this behaviour simu-
       lates a big file system.

   WARNINGS
       The filesystems are combined must provide a possibility to get their parameters correctly (e.g. size of free space). Otherwise the  writing
       failure can occur (but data consistency will be ok anyway). For example it is a bad idea to combine a several sshfs systems together.

       Please read FUSE documentation for a further conception.

COPYRIGHT

       Distributed under GPLv3

       Copyright (C) 2008 Dmitry E. Oboukhov <dimka@avanto.org>

								   February 2008							 mhddfs(1)
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