[shellscript] Passing a script with parameters to AT

chronozphere · 2011-07-10 15:26:06

Hey everybody,

I would like to learn shell scripting so I created a script to mount/unmount my truecrypt volume. This is what I have so far:

#!/bin/bash

case "$1" in
        start)
                truecrypt -k '' /dev/array/vault /home/<user>/vault
                ;;
        stop)
                truecrypt -d /home/<user>/vault
                ;;
        *)
                echo "usage: $0 (start|stop)"
esac
exit 0

Now I would like to add another feature. I want it to automatically unmount after 2 hours. I found the "at" command which should be able to do this.
I would need to do something like:

        start)
                truecrypt -k '' /dev/array/vault /home/<user>/vault
                at -f "$1 stop" now + 2 hours 
                ;;

However, running just " at -f "./vault.sh start" now + 2 minutes " fails:

warning: commands will be executed using /bin/sh
Cannot open input file ./vault.sh start: No such file or directory

If I can get this working I would like the "stop" code to remove any scheduled stop operations (for when I do it manually). Also, I would like to include a "keepalive" function that allows me to kill the scheduled stop task and reschedule it again to restart the countdown. This would allow me to keep the volume mounted if I want to use it for a longer period of time.

Is it possible to execute scripts + parameters with "at"? Can somebody help me to make this work?

Thanks a bunch!

P.S: Truecrypt also keeps asking me this:

Protect hidden volume (if any)? (y=Yes/n=No) [No]:

I would like to specify this in the command so that I don't have to hit enter every time. I've looked at the man page but found nothing helpfull. Anyone?

gadget3000 · 2011-07-12 19:24:51

Make sure that vault.sh exists in the directory that you are executing it from. It may be better to refer to the whole file location rather than just './'. eg use " at -f "~/vault.sh start" now + 2 minutes " rather than just " at -f "./vault.sh start" now + 2 minutes ".

Providing thatyou are happy for TrueCrypt to accept the default answer for any questions it asks you can just pipe yes into it:
yes | truecrypt -k '' /dev/array/vault ~/vault
Yes will 'press enter' to any questions that TrueCrypt asks.

Last edited by gadget3000 (2011-07-14 16:46:01)

Areopagite · 2014-08-26 15:01:03

Hello!

You can execute scripts + parameters with "at" this way:

echo DISPLAY=:0 ./vault.sh start | at now + 2 minutes

It works!

Trilby · 2014-08-26 15:28:47

Areopagite, please do not necrobump old threads

Neither of the users in this thread have even been on the forums in a year.

Feel free to open a new thread if you have a new question.

Closed.

Arch Linux

#1 2011-07-10 15:26:06

[shellscript] Passing a script with parameters to AT

#2 2011-07-12 19:24:51

Re: [shellscript] Passing a script with parameters to AT

#3 2014-08-26 15:01:03

Re: [shellscript] Passing a script with parameters to AT

#4 2014-08-26 15:28:47

Re: [shellscript] Passing a script with parameters to AT

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