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Top Forums UNIX for Beginners Questions & Answers How to run script through CGI? Post 302998293 by Corona688 on Monday 29th of May 2017 11:48:24 AM
Old 05-29-2017
A CGI script can't ask for input, it has to receive it in the first place, i.e. given by an HTML page web form. If it doesn't receive the input it wants, it should print a warning and quit.

Code:
<html><body>

<form action="http://mysite/cgi-bin/myscript.cgi" method="get">
<input type='text' name='somevalue1'>
<input type='text' name='somevalue2'>
<input type='submit'>
</form>
</body></html>

Hitting submit on this webpage will cause it to load a URL like http://mysite/cgi-bin/myscript.cgi?somevalue1=asdf&somevalue2=qwerty . The method="get" is important, since POST requests work differently.

The entire string somevalue1=asdf&somevalue2=qwerty will be found in QUERY_STRING which you can process as you please. I often do something like:

Code:
OLDIFS="$IFS"
IFS="&="
set -- $QUERY_STRING
IFS="$OLDIFS"

...which will leave $1 as "somevalue1", $2 as "asdf", $3 as "somevalue2", and $4 as "qwerty". set -- is a special, ancient syntax which sets the shell's $1 $2 ... argument variables, and IFS is a special variable which controls what characters the shell splits on - usually spaces, but here we use it to split the CGI string on ampersands and equals.

You can process that in a loop like
Code:
OLDIFS="$IFS" ; IFS="&=" ; set -- $QUERY_STRING ; IFS="$OLDIFS"

# HTML header must come before any other text is printed
echo "Content-type: text/plain"
echo

echo "QUERY_STRING was ${QUERY_STRING}"

while [ "$#" -gt 0 ] # Loop until $#, number of arguments, is zero
do
        case "$1" in
        somevalue1) echo "somevalue1 got $2" ;;
        somevalue2) echo "somevalue2 got $2" ;;
        *) ;;
        esac

        shift 2 # Delete $1 and $2, and move $3 $4 down
done


Last edited by Corona688; 05-29-2017 at 12:54 PM..
 

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SPEEDY_BACKEND(1p)														SPEEDY_BACKEND(1p)

NAME
speedy_backend - the backend process for a persistent Perl interpreter SYNOPSIS
none ; this program is not meant to be called directly. DESCRIPTION
speedy, short for SpeedyCGI, is a way to run perl scripts persistently, which can make them run much more quickly. After the script is initially run, instead of exiting, the perl interpreter is kept running inside a backend process, speedy_backend. Dur- ing subsequent runs, this interpreter is used to handle new executions instead of starting a new perl interpreter each time. A very fast frontend program, speedy, written in C, is executed for each request. This fast frontend then contacts the persistent Perl process, which is usually already running, to do the work and return the results. Each perl script runs in its own Unix process, so one perl script can't interfere with another. Command line options can also be used to deal with programs that have memory leaks or other problems that might keep them from otherwise running persistently. The speedy front end connects to the back end process, speedy_backend, via a Unix socket in /tmp. A queue is kept in a shared file in /tmp that holds an entry for each process. In that queue are the pids of the perl processes waiting for connections. The frontend pulls a process out of this queue, connects to its socket, sends over the environment and argv, and then uses this socket for stdin/stdout to the perl process. FILES
/tmp/speedy* A unix socket used to connect to the frontend process. AUTHOR
Sam Horrocks http://daemoninc.com sam@daemoninc.com NOTES
This manual page was created by Niko Tyni <ntyni@iki.fi> for Debian GNU/Linux, because the original program does not have one. It is based on the original and more complete CGI::SpeedyCGI(3pm) manual page. SEE ALSO
perl(1), CGI::SpeedyCGI(3pm), speedy(1) SPEEDY_BACKEND(1p)
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