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Full Discussion: DNS circular verify script
Top Forums Shell Programming and Scripting DNS circular verify script Post 302800837 by MadeInGermany on Tuesday 30th of April 2013 03:49:56 PM
Old 04-30-2013
You can change it like this:
Code:
# for safety turn off globbing (wild card matching in current directory)
set -f
...
    MHOST=$(dig -x "$A" +short)      # reverse lookup
    if test -n "$MHOST"; then        # If string has nonzero length then continue

      for HOST in $MHOST; do
            MADDR=$(dig "$HOST" +short)       # Now do forward lookup
            for ADDR in $MADDR; do
...

I also added another loop, for the opposite case: one host has multiple IP addresses.
For safety, variables should be quoted in command arguments.
But the for loop needs an unquoted variable, therefore the set -f at the beginning of the script.
A bit more safe and more elegant are while loops:
Code:
...
    dig -x "$A" +short |               # reverse lookup
    while read HOST; do
          dig "$HOST" +short |         # Now do forward lookup
          while read ADDR; do
...

This User Gave Thanks to MadeInGermany For This Post:
snoman1
 

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LEARN ABOUT DEBIAN

reverse-depends

reverse-depends(1)					      General Commands Manual						reverse-depends(1)

NAME

       reverse-depends - List the reverse-dependencies (or build-dependencies) of a package

SYNOPSIS

       reverse-depends [options] package

DESCRIPTION

       List  reverse-dependencies  (or build-dependencies) of package.	If the package name is prefixed with src: then the reverse-dependencies of
       all the binary packages that the specified source package builds will be listed.

OPTIONS

       -r RELEASE, --release=RELEASE
	      Query dependencies in RELEASE.  Default: current development release.

       -R, --without-recommends
	      Only consider Depends relationships, not Recommends.

       -s, --with-suggests
	      Also consider Suggests relationships.

       -b, --build-depends
	      Query build dependencies.  Synonym for --arch=source.

       -a ARCH, --arch=ARCH
	      Query dependencies in ARCH.  Besides valid architecture names, the special values any and source may  be	used.	any  displays  all
	      reverse dependencies, the union across all architecture.	source displays build dependencies.  Default: any.

       -c COMPONENT, --component=COMPONENT
	      Only consider reverse-dependencies in COMPONENT. Can be specified multiple times.  Default: all components.

       -l, --list
	      Display a simple, machine-readable list.

       -u URL, --service-url=URL
	      Reverse Dependencies web-service URL.  Default: UbuntuWire's service at http://qa.ubuntuwire.org/rdepends/.

       -h, --help
	      Display a help message and exit

EXAMPLES

       All reverse dependencies of source package bash:

	      reverse-depends src:bash

AUTHORS

       reverse-depends and this manpage were written by Stefano Rivera <stefanor@ubuntu.com>.

       Both are released under the terms of the ISC License.

ubuntu-dev-tools						   November 2011						reverse-depends(1)
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