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Top Forums Shell Programming and Scripting bash script for password recovery Post 302485779 by sujay.jauhar on Thursday 6th of January 2011 07:24:31 AM
Old 01-06-2011
bash script for password recovery

Hi all,

I'm a complete newbie to bash scripting, although I have some experience in programming. The thing is that I have a .dmg file on my mac which I protected with a password, and now I've forgotten it.

I remember the first few letters of the password and the characters that represent the last few letters, so I want to write a script that goes through all the options iteratively to find the correct one

Code:
#!/bin/bash
#my array of password options
psswrd=( one two three )
#first call to open the dmg file
hdiutil attach DOCS.dmg
#here i give it a wrong input password on purpose so it enters the loop
while [ $? = 1 ]; do
	hdiutil attach DOCS.dmg
        #at this point I'm prompted with "Enter password to access "DOCS.dmg":"
        #and instead of typing the input I want to iterate through the array "psswrd" and use each of its elements in turn as an answer to the prompt
        #also i want to be able to exit the loop if i've gone through the entire array and not found the correct password
done


Any help would be deeply appreciated.

Cheers.
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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