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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 HPUX

dh_usrlocal

DH_USRLOCAL(1)							     Debhelper							    DH_USRLOCAL(1)

NAME

       dh_usrlocal - migrate usr/local directories to maintainer scripts

SYNOPSIS

       dh_usrlocal [debhelperoptions] [-n]

DESCRIPTION

       dh_usrlocal is a debhelper program that can be used for building packages that will provide a subdirectory in /usr/local when installed.

       It finds subdirectories of usr/local in the package build directory, and removes them, replacing them with maintainer script snippets
       (unless -n is used) to create the directories at install time, and remove them when the package is removed, in a manner compliant with
       Debian policy. These snippets are inserted into the maintainer scripts by dh_installdeb. See dh_installdeb(1) for an explanation of
       debhelper maintainer script snippets.

       When the Rules-Requires-Root field is not (effectively) binary-targets, the directories in /usr/local will have ownership root:staff and
       the mode will be 02775.	These values have been chosen to comply with the recommendations of the Debian policy for directories in
       /usr/local.

       When Rules-Requires-Root has an effective value of binary-targets, the owners, groups and permissions will be preserved with one exception.
       If the directory is owned by root:root, then ownership will be reset to root:staff and mode will be reset to 02775. This is useful, since
       that is the group and mode policy recommends for directories in /usr/local.

OPTIONS

       -n, --no-scripts
	   Do not modify postinst/prerm scripts.

NOTES

       Note that this command is not idempotent. dh_prep(1) should be called between invocations of this command. Otherwise, it may cause multiple
       instances of the same text to be added to maintainer scripts.

CONFORMS TO

       Debian policy, version 2.2

SEE ALSO

       debhelper(7)

       This program is a part of debhelper.

AUTHOR

       Andrew Stribblehill <ads@debian.org>

11.1.6ubuntu2							    2018-05-10							    DH_USRLOCAL(1)
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