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Full Discussion: Piping to a python script
Top Forums Shell Programming and Scripting Piping to a python script Post 302690845 by neutronscott on Thursday 23rd of August 2012 12:26:59 PM
Old 08-23-2012
This is exactly the problem that people have when trying to automate ssh passwords. Instead of reading a password from stdin, the programs open the terminal directly. So by using a pipe, you're attaching a stream to stdin which is sent to myscript, but myscript does not read the password from stdin!

There is a TCL scripted program, called expect that simulates a terminal. Though putting passwords into files is not a very smart thing to do. I cannot provide assistance with creating an expect script though the man page does provide some examples.
 

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LEARN ABOUT LINUX

mkpasswd

MKPASSWD(1)							 Debian GNU/Linux						       MKPASSWD(1)

NAME

       mkpasswd - Overfeatured front end to crypt(3)

SYNOPSIS

       mkpasswd PASSWORD SALT

DESCRIPTION

       mkpasswd encrypts the given password with the crypt(3) libc function using the given salt.

OPTIONS

       -S, --salt=STRING
	      Use the STRING as salt. It must not contain prefixes such as $1$.

       -R, --rounds=NUMBER
	      Use  NUMBER  rounds. This argument is ignored if the method chosen does not support variable rounds. For the OpenBSD Blowfish method
	      this is the logarithm of the number of rounds.

       -m, --method=TYPE
	      Compute the password using the TYPE method.  If TYPE is help then the available methods are printed.

       -5     Like --method=md5.

       -P, --password-fd=NUM
	      Read the password from file descriptor NUM instead of using getpass(3).  If the file descriptor is not connected to a  tty  then	no
	      other message than the hashed password is printed on stdout.

       -s, --stdin
	      Like --password-fd=0.

ENVIRONMENT

       MKPASSWD_OPTIONS
	      A list of options which will be evalued before the ones specified on the command line.

BUGS

       If the --stdin option is used, passwords containing some control characters may not be read correctly.

       This programs suffers of a bad case of featuritis.

SEE ALSO

       passwd(1), passwd(5), crypt(3), getpass(3)

AUTHOR

       mkpasswd  and  this man page were written by Marco d'Itri <md@linux.it> and are licensed under the terms of the GNU General Public License,
       version 2 or higher.

Marco d'Itri							   21 March 2008						       MKPASSWD(1)
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