Grab a value from a variable (bash)?

elinenbe · 04-01-2008, 02:41 PM

I could use a bit of bash help -- not even sure if this is possible...

In the beginning of my script, I assign a couple of variables:

Code:

emails_eric="eric@jj.com, ericl@mrpibb.com, eric_l@work.com"
emails_mark="mark@mark.com, mark@work.com, mark@home.com"
emails_dave="dave@mrd.com, dave@school.edu, dave@none.com"

then I do something like

Code:

for user in eric mark dave
   echo $user
   ... do stuff with name user ...
   
done

Now, in the section do stuff with name user I'd love to use the for user loop to grab the emails from above. I can't figure this out:

I've tried stuff like

Code:

user_email="emails_"$user
echo $`echo $user_email`

What I would like to do is grab the values from the top of my script
So I could do something like "email emails_user", and it will use the list from above depending on the person.

Thanks,
Eric

unSpawn · 04-01-2008, 03:00 PM

Prolly should be simpler than this but something like 'for user in eric mark dave; do eval echo \${emails_${user}}; done'.

elinenbe · 04-01-2008, 03:13 PM

Thanks. I didn't know about eval. Sure cleans up my mess pretty nicely. Thanks!

elinenbe · 04-01-2008, 03:48 PM

How can I take the output of the eval and store it to a variable?

I'd love to do:

myemails =`eval echo \${emails_${user}}`
echo $myemails

but that's not working here. Any ideas?

Thanks,
Eric

unSpawn · 04-01-2008, 03:50 PM

Quote:

Originally Posted by elinenbe

Thanks. I didn't know about eval. Sure cleans up my mess pretty nicely.

Heh. NP. Here's some if you haven't read 'em:
http://www.tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html
http://www.tldp.org/LDP/Bash-Beginne...tml/index.html
http://www.tldp.org/LDP/abs/html/

elinenbe · 04-01-2008, 04:01 PM

I just had it out of order... figured it out. Thanks.

This worked:

Code:

eval myemails=\${emails_${user}}
echo $myemails