shell script fails to exit

twrig3846 · 02-09-2010, 08:46 PM

This is a very simple problem, but i'm scratching my head with others..

In composing a simple shell script in class, we can't seem to get the script to execute fully. script was formatted as follows.

#!/bin/bash
echo "good bye for now"
exit

did, Chmod 755 to make executable
type file name "bye"
runs but wont exit.....
it just echos the type"good bye for now
The instructor says it works for him at home....
But it wont work in class...
Is there a reason it wont "exit" the shell as commanded ?????

we are using putty with bash shell Linux.

Tinkster · 02-09-2010, 09:23 PM

What do you mean by "doesn't exit"? You don't get to a shell prompt,
it just sits there as if in a loop??

catkin · 02-10-2010, 12:10 AM

Works for me.

Code:

c:~$ echo '#!/bin/bash
> echo "good bye for now"
> exit' > /tmp/bye.sh
c:~$ chmod +x /tmp/bye.sh
c:~$ /tmp/bye.sh
good bye for now
c:~$

What are you doing different?

Tinkster · 02-10-2010, 12:27 AM

Hmmm ... maybe he expects the 'exit' in the script
to do what it would do on the shell - terminate the
session, close his putty connection?

twrig3846 · 02-10-2010, 12:32 AM

Yes it appears to echo good bye and returns to the shell prompt, the
instructor leads me to believe that this script should run and leave you
exiting the Linux program and exits back to windows, I seem to be missing
something somewhere...

When I type in the filename which is "bye" He says this should leave the Linux completely after saying "goodbye" or rather typing it.and cause you to exit as if you typed "exit" and hit enter.

Tinkster · 02-10-2010, 12:38 AM

Well ask him where he got that idea from.

An exit in a script will only terminate the SUB-shell that
you invoked when starting the script.

twrig3846 · 02-10-2010, 12:51 AM

Quote:

Originally Posted by catkin

Works for me.

Code:

c:~$ echo '#!/bin/bash
> echo "good bye for now"
> exit' > /tmp/bye.sh
c:~$ chmod +x /tmp/bye.sh
c:~$ /tmp/bye.sh
good bye for now
c:~$

What are you doing different?

I don't seem to be doing anything different, Maybe he is just testing us.
his statement was "does it work or not" if not why? and if so why?
maybe I'm chasing my tail, I know the exit command works if I'm not in the directory he tells us to be in so maybe that's my clue.
He starts us out by making a directory named bin in our home directory and in this directory to make a file named bye and to make this file executable and run this bye script.......this is where I'm at....????

twrig3846 · 02-10-2010, 12:53 AM

Quote:

Originally Posted by Tinkster

Well ask him where he got that idea from.

An exit in a script will only terminate the SUB-shell that
you invoked when starting the script.

You know I was just discussing this with my wife and thought of the exact same thing....I think he is testing me..The Instructor that is..

evo2 · 02-10-2010, 12:53 AM

Quote:

Originally Posted by twrig3846

I don't seem to be doing anything different, Maybe he is just testing us.
his statement was "does it work or not" if not why? and if so why?

There's your answer.

Evo2.

twrig3846 · 02-10-2010, 12:59 AM

I know I'm still a newbie and am learning all the time..Thanks to all who helped me out tonight, You have been a great help..I thought all along that this was the case but was expected to find my own answer.. The KW book and the SKS are very vague in some explanations...Thank You

twrig3846 · 02-10-2010, 01:01 AM

Quote:

Originally Posted by evo2

There's your answer.

Evo2.

Thanks I thought so all along but wasn't sure...

chrism01 · 02-10-2010, 01:10 AM

Here's some very good tutorials for bash etc
http://rute.2038bug.com/index.html.gz
http://tldp.org/LDP/Bash-Beginners-G...tml/index.html
http://www.tldp.org/LDP/abs/html/

BTW if you 'sourced' the script, it would log you off ie

Code:

. script.sh

OR

source script.sh

Read those links to see why...