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Subject
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the simplest shell script--broken
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| | Posted by | grimholtz (DH New User
) | | Posted on | 08/24/06 05:03 PM |
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Hi,
I'm trying to get bash shell scripts working from the web (not from the shell). I have:
#!/bin/bash
echo 'Content-type: text/html\n\n'
echo '<html><body>hello world</body></html>\n'
I save this as test.cgi. When I navigate to this URL, I get an HTTP 500 (server) error. What am I doing wrong?
Thanks,
grimholtz
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Subject
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Re: the simplest shell script--broken
[re: grimholtz]
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| | Posted by | sdayman (DH Smarty Pants) | | Posted on | 08/24/06 05:09 PM |
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Have you read the wiki on it?
http://wiki.dreamhost.com/index.php/KB_/_Web_Programming_/_CGI,_PHP_&_Databases#What_is_an_internal_server_error.2C_and_why_doesn.27t_my_CGI_work.3F
My first guess was going to be that you need to chmod 755 your file.
-Scott
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Subject
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Re: the simplest shell script--broken
[re: grimholtz]
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| | Posted by | rlparker (DH Grizzled Veteran) | | Posted on | 08/24/06 05:31 PM |
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It runs fine from the shell command line, but the error log shows:
[Thu Aug 24 17:08:47 2006] [error] [client xx.xx.xx.xx] malformed header from script. Bad header=<html><body>hello world</body>: /home/xxxx/wwwdirectoryl/test.cgi
[Thu Aug 24 17:08:47 2006] [error] [client xx.xx.xx.xx] File does not exist: /home/xxxx/wwwdirectoryl/internal_error.html
-----try this one --------
#!/bin/bash
echo "Content-type: text/plain"
echo
set
----------------------------
More good cgi stuff on headers is found here
--rlparker
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Subject
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Re: the simplest shell script--broken
[re: sdayman]
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| | Posted by | grimholtz (DH New User
) | | Posted on | 08/24/06 05:55 PM |
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It wasn't a permissions issue. I've set the permissions to 775. The error in the log is:
Premature end of script headers: test.cgi.
The wiki you linked to says this errors is caused because the header "aren't being printed correctly. here is a basic working script:". However, the basic working script is in perl, and I want to remain in bash for this.
Also, I'm editing this in vi... not ftp'ing so CR/LF shouldn't be an issue. Any other ideas?
Thanks!
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Subject
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Re: the simplest shell script--broken
[re: grimholtz]
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| | Posted by | grimholtz (DH New User
) | | Posted on | 08/24/06 06:14 PM |
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OK, I see suexec requires it to be 755. I've done that--still get 500 error code. Help!
edit: I figured it out. \n doesn't work as a newline in bash. i need to use "echo" on its own line to get the required CR after headers are complete.
thanks.Edited by grimholtz on 08/24/06 06:27 PM (server time).
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Subject
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Re: the simplest shell script--broken
[re: grimholtz]
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| | Posted by | gordaen (DH Enthusiast) | | Posted on | 08/25/06 08:40 AM |
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You can also do something like this:
#!/bin/bash
echo 'Content-type: text/html
<html><body>Hello World!!</body></html>'
Check out Gordaen's Knowledge, the blog, and the MR2 page.
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Subject
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Re: the simplest shell script--broken
[re: grimholtz]
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| | Posted by | emmesel (DH New User
) | | Posted on | 08/25/06 02:58 PM |
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you want to use the "-e" option on the command-line, like so:
#!/bin/bash
echo -e 'Content-type: text/html\n\n'
echo -e '<html><body>hello world</body></html>\n'
otherwise, the "\n" is displayed literally and not as an actual newline character.
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