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Full Discussion: Unable to change environment variables in bash script
Top Forums Shell Programming and Scripting Unable to change environment variables in bash script Post 302466483 by markolopa on Tuesday 26th of October 2010 12:51:30 PM
Old 10-26-2010
Sorry, I realise now that my post was not clear enough.

All I want is be able to use the string "PASSWORD" instead of my actual password in the export commands inside my .bashrc and to change these variables replacing "PASSWORD" by the actual password by using a script. In that way my password is not written in the disk.

I just found a way to do it. Here is it:
Code:
read -s -p "Password: " passw; echo
for var in `set | perl -lne 'print $1 if /(.*?)=.*PASSWORD/'`; do
    eval val=\${$var//PASSWORD/$passw}
    #echo "val = $val"
    eval export $var=\'$val\'
done

The for line is kind of ugly, but I couldn't find a more elegant way of looping over all environment variables. Anyway, it works and I am happy with it.

The final difficulty I had with it is that if I put "#!/bin/bash" in the beginning and call the script as a sub shell I don't get the exports... The solution was to add

alias set-password='source $HOME/bin/set-password.sh'

to my .bashrc, to avoid having to type the source command.

Thanks a lot everybody!
Marko
 

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LEARN ABOUT DEBIAN

systemd-ask-password-console.service

SYSTEMD-ASK-PASSWORD-CONSOLE.SERVICE(8) 	       systemd-ask-password-console.service		   SYSTEMD-ASK-PASSWORD-CONSOLE.SERVICE(8)

NAME

       systemd-ask-password-console.service, systemd-ask-password-console.path, systemd-ask-password-wall.service, systemd-ask-password-wall.path
       - Query the user for system passwords on the console and via wall

SYNOPSIS

       systemd-ask-password-console.service

       systemd-ask-password-console.path

       systemd-ask-password-wall.service

       systemd-ask-password-wall.path

DESCRIPTION

       systemd-ask-password-console.service is a system service that queries the user for system passwords (such as hard disk encryption keys and
       SSL certificate passphrases) on the console. It is intended to be used during boot to ensure proper handling of passwords necessary for
       boot.  systemd-ask-password-wall.service is a system service that informs all logged in users for system passwords via wall(1). It is
       intended to be used after boot to ensure that users are properly notified.

       See the developer documentation[1] for more information about the system password logic.

       Note that these services invoke systemd-tty-ask-password-agent(1) with either the --watch --console or --watch --wall command line
       parameters.

SEE ALSO

       systemd(1), systemd-tty-ask-password-agent(1), wall(1)

NOTES

	1. developer documentation
	   https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents

systemd 237												   SYSTEMD-ASK-PASSWORD-CONSOLE.SERVICE(8)
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