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Full Discussion: OSX verify username and password in one line
Operating Systems OS X (Apple) OSX verify username and password in one line Post 302749861 by jim mcnamara on Saturday 29th of December 2012 08:33:34 PM
Old 12-29-2012
MEL used to be the maya embedded scripting language. What does that have to do with a bash terminal command? It sounds like you need the MEL syntax to execute a bash script or command.

I do not know MEL - you get to figure out how to execute something like this native UNIX statement:
Code:
/bin/bash -c '/folder/to/myscript.sh foo bar'

where foo is the valid username and bar is the valid password. And be able to see the status return code of the script a 1 (one) or a 0 (zero).

script lives in /somefolder/somewhere/you/put/it, with file permissions 755:
Code:
#!/bin/bash
trap 'exit 1' INT
echo -n 'Enter username: '
read u
echo -n 'password: '
read p
[[ "$1" = "$u"  && "$2" = "$p" ]] && exit 0 
exit 1

myscript.sh does all the stuff you cannot do in "one line", it has a status code of 0 if all is well, 1 otherwise.

Plus - as a wild guess - I believe that your question is probably ill-formed. There must be a way to run your MEL script process from bash itself under maya, maya is an executable. You are already running MEL.

You could construct your password query there, since you appear to have a hard-coded password and username anyway. Then either run or not run the entire maya/app/scripts bundle.
partial bash/Pseudocode ( I know nothing about maya)
Code:
#!/bin/bash
password=bar
username=foo

trap 'exit 1' INT
echo -n 'Enter username: '
read u
echo -n 'password: '
read p
[[ "$1" != "$username"  || "$2" != "$password" ]] && exit 1
# run maya bundle here
maya blah blah

 

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LEARN ABOUT DEBIAN

unix2_chkpwd

UNIX2_CHKPWD(8) 						 Linux-PAM Manual						   UNIX2_CHKPWD(8)

NAME

       unix2_chkpwd - helper binary that verifies the password of the current user

SYNOPSIS

       /sbin/unix2_chkpwd servicename username

DESCRIPTION

       unix2_chkpwd  is  a  helper program for applications that verifies the password of the current user.  It is not intended to be run directly
       from the command line and logs a security violation if done so.

       It is typically installed setuid root or setgid shadow and called by applications, which only wishes to do an user authentication and noth-
       ing more.

OPTIONS

       unix2_pwdchk requires the following arguments:

       pam_service
	      The name of the service using unix2_chkpwd. This is required to be one of the services in /etc/pam.d

       username
	      The name of the user whose password you want to verify.

INPUTS

       unix2_pwdchk expects the password via stdin.

RETURN CODES

       unix2_chkpwd has the following return codes:

       1      unix2_chkpwd was inappropriately called from the command line or the password is incorrect.

       0      The password is correct.

HISTORY

       Written by Olaf Kirch loosely based on unix_chkpwd by Andrew Morgan

SEE ALSO

       pam(8)

AUTHOR

       Emily Ratliff.

Linux-PAM 0.76							    2003-03-21							   UNIX2_CHKPWD(8)
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