Enter a password automatically w/ bash script?

bns · 08-10-2007

I have a script.

Code:

#!/bin/bash
if iwlist eth0 scanning | grep -q 'ESSID1'
then iwconfig eth0 essid ESSID1 key WEP-KEY && dhclient eth0
elif iwlist eth0 scanning | grep -q 'ESSID2'
then iwconfig eth0 essid ESSID2 && iu-vpn-ipsec start
fi

iu-vpn-ipsec asks for a password. I want this script to run when the computer starts, so I don't want to have to enter the password manually. Does anyone know how get my script to enter the password for me?

P.S. I also asked on ubuntuforums, but haven't gotten a positive answer yet.

hairy_Palms · 08-11-2007

i can only recommend what i use for sudo, i use

Code:

echo "password" | sudo -S insertcommandhere

which id guess for you would be

Code:

echo "password" | iu-vpn-ipsec start

c.dric · 08-11-2007

Quote:

Originally Posted by hairy_Palms

i can only recommend what i use for sudo, i use

Code:

echo "password" | sudo -S insertcommandhere

which id guess for you would be

Code:

echo "password" | iu-vpn-ipsec start

that's good to know ... i was looking for a way to do that a few weeks ago.

bns · 08-11-2007

Well, it doesn't work in my case. It gives me

Code:

stty: standard input: Invalid argument

Thanks though.

yaaarrrgg · 08-11-2007

for complex interactive tools, the "expect" tool is probably the most powerful.

Otherwise for simple scripts you can do something like:

sudo umount /media/disk << eob
YOURPASSWORD
eob

(the eob just marks a "here" document ... can be any unique string)

bns · 08-11-2007

Quote:

Originally Posted by yaaarrrgg

for complex interactive tools, the "expect" tool is probably the most powerful.

Yeah, I think "expect" is going to be the way to go. A guy suggested it on ubuntuforums. It's kinda more advanced than I am though, so I'll have to spend some time learning how to make it work. If you know a beginner's tutorial for it, I'd appreciate it if you'd link it.

yaaarrrgg · 08-11-2007

this tutorial seems to cover most things you'd need.

http://floppsie.comp.glam.ac.uk/Glam...ripting/5.html

it probably looks worse than it really is, but the two main commands are just 'send' and 'expect'

bns · 08-11-2007

Thanks, yaarrrggg. I'll give it a look.

hairy_Palms · 08-11-2007

that looks a more elegant solution than echo and pipe

i might have to look into that myself ^^

bns · 08-11-2007

Beautiful. I think it worked. I won't know for sure until I try it at school, but it looks like it's working. Thanks.

javaJake · 08-15-2007

As always, keep in mind the security risks behind these methods. They all require the password to be pre-stored somewhere. Make sure no one but trusted people can even touch the file containing your root password.

You probably already knew this, but someone has to say it.

bns · 08-15-2007

Quote:

Originally Posted by javaJake

As always, keep in mind the security risks behind these methods. They all require the password to be pre-stored somewhere. Make sure no one but trusted people can even touch the file containing your root password.

You probably already knew this, but someone has to say it.

Thanks for the obligatory security comment.

I wouldn't do it on a computer that others could get to; it's on my laptop that stays with me. So if you want to access my computer, you need to beat me up first

... and if you do that, frankly my password is the least of my worries.

javaJake · 08-15-2007

Quote:

Originally Posted by bns

Thanks for the obligatory security comment.

I wouldn't do it on a computer that others could get to; it's on my laptop that stays with me. So if you want to access my computer, you need to beat me up first

... and if you do that, frankly my password is the least of my worries.

Yea, your clients won't be happy about their SS#'s...

08-10-2007	#1 (permalink)
bns Moderator Join Date: May 2007 Location: Indiana, USA Posts: 1,648	Enter a password automatically w/ bash script? I have a script. Code: #!/bin/bash if iwlist eth0 scanning \| grep -q 'ESSID1' then iwconfig eth0 essid ESSID1 key WEP-KEY && dhclient eth0 elif iwlist eth0 scanning \| grep -q 'ESSID2' then iwconfig eth0 essid ESSID2 && iu-vpn-ipsec start fi iu-vpn-ipsec asks for a password. I want this script to run when the computer starts, so I don't want to have to enter the password manually. Does anyone know how get my script to enter the password for me? P.S. I also asked on ubuntuforums, but haven't gotten a positive answer yet.
	"Give a man fire, and he will be warm for a day; set a man on fire and he will be warm for the rest of his (short) life."---Wofl

08-11-2007	#2 (permalink)
hairy_Palms Chuck Norris Join Date: May 2007 Location: London, England Posts: 330	Re: Enter a password automatically w/ bash script? i can only recommend what i use for sudo, i use Code: echo "password" \| sudo -S insertcommandhere which id guess for you would be Code: echo "password" \| iu-vpn-ipsec start
	http://www.venganza.org/about/open-letter/ "Creationism is not a scientific alternative to natural selection any more than the stork theory is an alternative to sexual reproduction." — Hayes, 1996.

08-11-2007	#4 (permalink)
bns Moderator Join Date: May 2007 Location: Indiana, USA Posts: 1,648	Re: Enter a password automatically w/ bash script? Well, it doesn't work in my case. It gives me Code: stty: standard input: Invalid argument Thanks though.
	"Give a man fire, and he will be warm for a day; set a man on fire and he will be warm for the rest of his (short) life."---Wofl

08-11-2007	#5 (permalink)
yaaarrrgg Eligible for a custom title Join Date: May 2007 Location: Indiana, USA Posts: 791	Re: Enter a password automatically w/ bash script? for complex interactive tools, the "expect" tool is probably the most powerful. Otherwise for simple scripts you can do something like: sudo umount /media/disk << eob YOURPASSWORD eob (the eob just marks a "here" document ... can be any unique string)

08-11-2007	#7 (permalink)
yaaarrrgg Eligible for a custom title Join Date: May 2007 Location: Indiana, USA Posts: 791	Re: Enter a password automatically w/ bash script? this tutorial seems to cover most things you'd need. http://floppsie.comp.glam.ac.uk/Glam...ripting/5.html it probably looks worse than it really is, but the two main commands are just 'send' and 'expect'

08-11-2007	#8 (permalink)
bns Moderator Join Date: May 2007 Location: Indiana, USA Posts: 1,648	Re: Enter a password automatically w/ bash script? Thanks, yaarrrggg. I'll give it a look.
	"Give a man fire, and he will be warm for a day; set a man on fire and he will be warm for the rest of his (short) life."---Wofl

08-11-2007	#9 (permalink)
hairy_Palms Chuck Norris Join Date: May 2007 Location: London, England Posts: 330	Re: Enter a password automatically w/ bash script? that looks a more elegant solution than echo and pipe i might have to look into that myself ^^
	http://www.venganza.org/about/open-letter/ "Creationism is not a scientific alternative to natural selection any more than the stork theory is an alternative to sexual reproduction." — Hayes, 1996.

08-11-2007	#10 (permalink)
bns Moderator Join Date: May 2007 Location: Indiana, USA Posts: 1,648	Re: Enter a password automatically w/ bash script? Beautiful. I think it worked. I won't know for sure until I try it at school, but it looks like it's working. Thanks.
	"Give a man fire, and he will be warm for a day; set a man on fire and he will be warm for the rest of his (short) life."---Wofl