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Full Discussion: pass a password to an application
Top Forums Shell Programming and Scripting pass a password to an application Post 302335375 by durden_tyler on Saturday 18th of July 2009 08:48:49 PM
Old 07-18-2009
Quote:
Originally Posted by latenite
...
how do I pass that passwd (the content of the variable) to the application being called?
...
For better control, you may want to try out "Expect" scripting - Expect - Expect - Home Page

Whereas a kludge using just shell scripts is as follows:

Code:
$ 
$ file testfile.*
testfile.gpg: GPG encrypted data
$ 
$ cat decrypt.sh
#!/bin/bash
gpg --output testfile.txt --decrypt testfile.gpg

$ 
$ cat passphrase.txt
disneyland
$ 
$ . decrypt.sh <passphrase.txt

You need a passphrase to unlock the secret key for
user: "Alice"
2048-bit ELG-E key, ID 46972146, created 2009-07-18 (main key ID 53FD32A9)

gpg: encrypted with 2048-bit ELG-E key, ID 46972146, created 2009-07-18
      "Alice"
$ 
$ file testfile.*
testfile.gpg: GPG encrypted data
testfile.txt: ASCII text
$ 
$ cat testfile.txt
this is a test file
that I'd like to encrypt/decrypt
using gpg
$ 
$

tyler_durden
 

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LEARN ABOUT DEBIAN

amcryptsimple

AMCRYPTSIMPLE(8)					  System Administration Commands					  AMCRYPTSIMPLE(8)

NAME

       amcryptsimple - reference simple crypt program for Amanda symmetric data encryption

SYNOPSIS

       amcryptsimple  to be called by Amanda only

DESCRIPTION

       amcryptsimple calls gpg to perform symmetric data encryption on Amanda backup.  amcryptsimple will search for the gpg program in the
       following directories: /usr/local/bin:/usr/bin:/usr/sbin:/bin:/sbin

       amcryptsimple uses one passphrase to encrypt the Amanda data and uses the same passphrase to decrypt the Amanda backup data.  amcryptsimple
       uses AES256 as the symmetric cipher.

HOW TO CREATE PASSPHRASE

       Store the passphrase inside the home-directory of the Amanda user ($amanda_user) and protect it with proper permissions:

       echo my_secret_passphrase > ~$amanda_user/.am_passphrase
       chown $amanda_user:disk ~$amanda_user/.am_passphrase
       chmod 700 ~$amanda_user/.am_passphrase

NOTES

       Choose a good passphrase and protect it properly. Backup data can only be restored with the passphrase. There is no backdoor.

       If storing and securing passphrase in your environment presents challenges, Amanda provide public-key data encryption through amgpgcrypt.
       Public-key encryption uses the public key to encrypt and uses the private key to decrypt.

SEE ALSO

       amanda(8), amanda.conf(5), amcrypt(8), amgpgcrypt(8), amrestore(8), gpg(1)

       The Amanda Wiki: : http://wiki.zmanda.com/

AUTHOR

       Kevin Till <kevin.till@zmanda.com>
	   Zmanda, Inc. (http://www.zmanda.com)

Amanda 3.3.1							    02/21/2012							  AMCRYPTSIMPLE(8)
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