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Full Discussion: Getting input and changing variable?
Top Forums UNIX for Dummies Questions & Answers Getting input and changing variable? Post 302875129 by Corona688 on Monday 18th of November 2013 02:23:29 PM
Old 11-18-2013
Your other script has to process ${QUERY_STRING} and extract the variable from it. ${QUERY_STRING} will contain values like
Code:
VAR1=value1&VAR2=value2&VAR3=value3

just like you'd see appended to the end of the webpage.

I process it like this:

Code:
# Just an example/test, you should not set QUERY_STRING yourself
QUERY_STRING="a=b&c=d&g=h&i=j"

OLDIFS="$IFS"
IFS="&" # Split strings upon & instead of space
        set -- ${QUERY_STRING} # Set $1="a=b", $2="c=d", $3="g=h", $4="i=j"
        while [ "$#" -ne 0 ] # Loop until we're all out of $1 $2 $3 ...
        do
                IFS="=" read NAME VAL <<EOF
${1}
EOF
                IFS="=" read CGI_"$NAME" VAL <<EOF
${1}
EOF
                shift # Get rid of $1 so $1="c=d", $2="g=h", ...
        done

IFS="$OLDIFS" # Return to default splitting behavior

echo ${CGI_a}
echo ${CGI_c}
echo ${CGI_g}

You will end up with variables like CGI_a, CGI_c, CGI_g, and so forth. The CGI_ prefix is so that web users can't accidentally (or worse, maliciously) change important, special variables like PATH in your script... This way if someone tries, all they'll set is CGI_PATH.

All the read junk is just a tricky way of setting random variable names without resorting to eval. This prevents malicious web users from feeding `rm -Rf ~/ into your code...
Last edited by Corona688; 11-18-2013 at 03:31 PM..
 

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LEARN ABOUT DEBIAN

hobbitgraph.cgi

HOBBITGRAPH.CGI(1)					      General Commands Manual						HOBBITGRAPH.CGI(1)

NAME

       hobbitgraph.cgi - CGI to generate Xymon trend graphs

SYNOPSIS

       hobbitgraph [options]

DESCRIPTION

       hobbitgraph.cgi is invoked as a CGI script via the hobbitgraph.sh CGI wrapper.

       hobbitgraph.cgi is passed a QUERY_STRING environment variable with the following parameters:

       host Name of the host to generate a graph for

       service Name of the service to generate a graph for

       disp Display-name of the host, used on the generated graphs instead of hostname.

       graph Can be "hourly", "daily", "weekly" or "monthly" to select the time period that the graph covers.

       first Used to split multi-graphs into multiple graphs. This causes hobbitgraph.cgi to generate only the graphs starting with the "first'th"
       graph and continuing for "count".

       count Number of graphs in a multi-graph.

       upper Set the upper limit of the graph. See rrdgraph(1) for a description of the "-u" option.

       lower Set the lower limit of the graph. See rrdgraph(1) for a description of the "-l" option.

       graph_start Set the starttime of the graph. This is used in zoom-mode.

       graph_end Set the end-time of the graph. This is used in zoom-mode.

       action=menu Generate an HTML page with links to 4 graphs, representing the hourly, weekly, monthly and yearly graphs. Doesn't actually gen-
       erate any graphs, only the HTML that links to the graphs.

       action=selzoom  Generate an HTML page with link to single graph, and with JavaScript code that lets the user select part of the graph for a
       zoom-operation. The JavaScript invokes hobbitgraph.cgi with "action=showzoom" to generate the zoomed graph webpage.

       action=showzoom Generate HTML with a link to the zoomed graph image. This link goes to an "action=view" invocation of hobbitgraph.cgi.

       action=view Generate a single graph image.

OPTIONS

       --config=FILENAME
	      Loads the graph configuration file from FILENAME. If not specified, the file $BBHOME/etc/hobbitgraph.cfg is used.  See  the  hobbit-
	      graph.cfg(5) for details about this file.

       --env=FILENAME
	      Loads the environment settings defined in FILENAME before executing the CGI.

       --rrddir=DIRECTORY
	      The top-level directory for the RRD files. If not specified, the directory given by the BBRRDS environment is used.

       --save=FILENAME
	      Instead of returning the image via the CGI interface (i.e. on stdout), save the generated image to FILENAME.

       --debug
	      Enable debugging output.

ENVIRONMENT

       QUERY_STRING Provided by the webserver CGI interface, this decides what graph to generate.

FILES

       hobbitgraph.cfg: The configuration file determining how graphs are generated from RRD files.

SEE ALSO

       hobbitgraph.cfg(5), xymon(7), rrdtool(1)

Xymon							    Version 4.2.3:  4 Feb 2009						HOBBITGRAPH.CGI(1)
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