bash scripting

bash scripting

[dave]

I wrote the following script to learn to read and write files.  No matter how I
try to start it it doesn't work.  

#!/bin/bash

shopt -s -o nounset

declare LINE

exec 3< test.dat

while read LINE <&3 ; do
  printf "%s\n" "$LINE" 
done

exit 0

this is the error 

[root@localhost scripts]# ./test.sh
: bad interpreter: No such file or directory
[root@localhost scripts]#

can someone point me in the write direction?  thanks again
Dave

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Re: bash scripting

[John Kelly]

Hi,
On Fri, 13 Aug 2004 23:35:14 -0700
"" <dave@dpomeroy.com> wrote:

> 
> 
> I wrote the following script to learn to read and write files.  No
> matter how I try to start it it doesn't work.  
> 
> #!/bin/bash
> 
> shopt -s -o nounset
> 
> declare LINE
> 
> exec 3< test.dat
> 
> while read LINE <&3 ; do
>   printf "%s\n" "$LINE" 
> done
> 
> exit 0
> 

I copied this into a file and it runs fine on my Debian system. I
think your error message gives a hint.

> this is the error 
> 
> [root@localhost scripts]# ./test.sh
> : bad interpreter: No such file or directory
> [root@localhost scripts]#
> 
 : bad interpreter: No such file or directory
 
Usually means that the system can't find the interpreter. ie when it
looks at the line:#!/bin/bash
it can't find /bin/bash. 
I have seen similiar problems with perl. Someone puts 
#!/bin/perl 
in a script. It works on one machine but if the script is moved to
another machine, it bombs out because the perl interpreter is in a
different place. 

I assume bash is on your system. Try running 
which bash
to find the path to the bash excutable. On most Linux systems it is
/bin/bash but I have seen /usr/local/bin/bash and /opt/bin/bash (on a
Solaris system).

Incidently, my standard way of writing scripts in vi is to type 
#!
Then type <ESC>
Then type : r ! which bash
This causes the path to bash appear on the line under the #! line.
I then move the cursor up one line and type J to join the lines.
This guarantees the correct path to the interpreter on the machine I
am using. But then you may not be using vi :-)

Hope this helps.

regards,

John Kelly
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bash scripting

[dave]

OK I installed Mandrake 10 official and all things seem to be normal.  I 
still get the same message when I try to run a bash script.

#!/bin/env
bash


shopt -s -o nounset

declare LINE

exec 3< /home/dave/scripts/test.dat

while read LINE <&3 ; do
  printf "%s\n" "$LINE"
done

exit 0

and here is the error message I get.

[dave@dave scripts]$ ./new.sh
: bad interpreter: No such file or directory
[dave@dave scripts]$

Anyone have any ideas.  I used whereis bash and it returned /bin/bash.
  Everything seems normal and I guess I'm over my head.  Anyone with any 
suggestions?

Thanks in advance.
Dave

-- 
Dave Pomeroy K7DNP SouthEastern Washington

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Re: bash scripting

[John Kelly]

Hi,
I just tried to run the '#!/bin/env bash ' version of this script and
I
got:=================================================================
===== jpk@debian:~/scratch$ ./test.sh
bash: ./test.sh: /bin/env: bad interpreter: No such file or directory
======================================================================
On my system env is in /usr/bin. 
===================================
jpk@debian:~/scratch$ which env
/usr/bin/env
===================================
So this is essentially the same error as before - you are telling the
shell to run a program which is not where you say it is. 

You can use the original version of the program and pass the correct
location of the bash interpreter to it. eg the first line should be
something like:#!/correct/path/to/bash
Of course the /correct/path/to/bash on my system is /bin/bash
 
Or use the later version and pass the correct location of env to it.
eg the first line should be something like:#!/correct/path/to/env bash
On my system the /correct/path/to/env is /usr/bin/env

Both of these work on my system. 

Here's hoping I have not added to your confusion :-)

regards,

John Kelly

On Sat, 14 Aug 2004 12:35:41 -0800
dave <dave@dpomeroy.com> wrote:

> OK I installed Mandrake 10 official and all things seem to be
> normal.  I still get the same message when I try to run a bash
> script.
> 
> #!/bin/env
> bash
> 
> 
> shopt -s -o nounset
> 
> declare LINE
> 
> exec 3< /home/dave/scripts/test.dat
> 
> while read LINE <&3 ; do
>   printf "%s\n" "$LINE"
> done
> 
> exit 0
> 
> and here is the error message I get.
> 
> [dave@dave scripts]$ ./new.sh
> : bad interpreter: No such file or directory
> [dave@dave scripts]$
> 
> Anyone have any ideas.  I used whereis bash and it returned
> /bin/bash.  Everything seems normal and I guess I'm over my head. 
> Anyone with any suggestions?
> 
> Thanks in advance.
> Dave
> 
> -- 
> Dave Pomeroy K7DNP SouthEastern Washington
> 
> -
> To unsubscribe from this list: send the line "unsubscribe
> linux-newbie" in the body of a message to majordomo@vger.kernel.org
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> 
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Re: bash scripting

[Ray Olszewski]

At 12:35 PM 8/14/2004 -0800, dave wrote:
>OK I installed Mandrake 10 official and all things seem to be normal.  I 
>still get the same message when I try to run a bash script.
>
>#!/bin/env
>bash
>
>
>shopt -s -o nounset
>
>declare LINE
>
>exec 3< /home/dave/scripts/test.dat
>
>while read LINE <&3 ; do
>  printf "%s\n" "$LINE"
>done
>
>exit 0
>
>and here is the error message I get.
>
>[dave@dave scripts]$ ./new.sh
>: bad interpreter: No such file or directory
>[dave@dave scripts]$
>
>Anyone have any ideas.  I used whereis bash and it returned /bin/bash.
>  Everything seems normal and I guess I'm over my head.  Anyone with any 
> suggestions?

You made two changes, not one. You both changed the distro install 
("installed Mandrake 10") -AND- changed the shebang line in the script 
("#!/bin/env"). The second change is definitely wrong.

Go back to the original shebang line ("#!/bin/bash") and see if it works 
now. It does on my system (that is, I get errors, but they involve my not 
having a file named /home/dave/scripts/test.dat).

Or make the first line (probably; check where "env' is on your system) 
"#!/usr/bin/env bash". It too works here (up to the same error).

BTW, if I have the interpreter name wrong, I get a slightly different form 
of error message from you (on a Debian-Sid install). Here, I changed "bash" 
to "nash" and got this:

-bash: ./testscript.sh: /bin/nash: bad interpreter: No such file or directory

Not sure why you're not seeing all that stuff to the left of the ": bad 
interpreter" part. Could just be a difference between your default shell 
and mine (2.05b-19). Or it might indicate something odd about your script 
that is not making it through a representation as e-mail.





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bash scripting

[dave]

I tried the same script with #!/bin/bash as the first line and get the 
same error.  Then I cd to /bin and do a ls bash and this is what I get.

[dave@dave bin]$ ls bash
bash*
[dave@dave bin]$ ./bash
[dave@dave bin]$ /home/dave/scripts/new.sh
: bad interpreter: No such file or directory
[dave@dave bin]$

Then I tried the samw script again and I get the same error.  I used 
chmod and set the script file as 777.  Still no go.  I believe its not 
finding bash but I sure can't tell why.  I ran a setup.sh script in 
/usr/share/webmin today and it ran just fine.  I am confused   Any more 
ideas?  Thanks again.
Dave

-- 
Dave Pomeroy K7DNP SouthEastern Washington

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bash scripting

[dave]

Well I got it to run.  I browsed the web a bit and found this command 
cat -v new.sh.  That showed lots of ^M at the end of each line.  Then I 
used :set ff=unix to set the file format for unix.  It works now.  I 
don't know how the ^M's got in the file.  I wrote it on my linux box.  
Thanks everyone for the help.
Dave

-- 
Dave Pomeroy K7DNP SouthEastern Washington

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