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Using shell script for CGI

Posted on 1998-12-04
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Last Modified: 2013-12-25
I want to use a shell script as a cgi that basically GREPs
a text file.  I can use $QUERY_STRING in the grep statement,
but if I call this script from a form and pass it a value,
what's the easiest way of stripping the name= prefix from the value of QUERY_STRING?  I only need to pass one value.

Here's the basic script:

#!/bin/sh
echo Content-type: text/html
echo
echo '<HEAD><TITLE>Search</TITLE></HEAD>'
echo '<P>'
echo Searching on: $QUERY_STRING
echo '<P>'
echo '<H4><PRE>'
grep $QUERY_STRING /somedir/myfile.txt
echo '</PRE></H4>'

Calling the cgi as a standalone URL works, but with a FORM the name= is prepended to the query - how can I reference everything after the '=' in the GREP?
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Question by:wisdom042597
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9 Comments
 
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Expert Comment

by:MaDdUCK
ID: 1829945
try:
grep "perl -F"name:" -ane 'print $F[1];" myfile.txt
0
 
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Expert Comment

by:MaDdUCK
ID: 1829946
arg---
I mean:

perl -F"name:" -ane 'system("grep $F[1] myfile.txt")'

sorry.
0
 
LVL 8

Expert Comment

by:MaDdUCK
ID: 1829947
god, I am dumb today.
last try:

echo $QUERY_STRING | perl -F"name:" -ane 'system("grep $F[1] myfile.txt")'
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Author Comment

by:wisdom042597
ID: 1829948
I'd prefer a shell-based solution, not using Perl.  I don't want to call Perl and allocate 500+k of memory for such a simple operation.
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Accepted Solution

by:
MaDdUCK earned 50 total points
ID: 1829949
then experiment with
echo $QUERY_STRING | cut -f 2 -d: -s
which will return what you are looking for.
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Expert Comment

by:MaDdUCK
ID: 1829950
echo "name:ma" | cut -f 2 -d= -s
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Expert Comment

by:MaDdUCK
ID: 1829951
argh!
I am wild again.
I mean
echo $QUERY_STRING | cut -f 2 -d= -s

sorry sorry
0
 
LVL 1

Author Comment

by:wisdom042597
ID: 1829952
Thanks - this does work.  It would be nice if you explained more about how it works and how to customize it.  I modified my script to set another environment variable equal to the results of the operation so I could use the processed data in multiple statements.
0
 
LVL 8

Expert Comment

by:MaDdUCK
ID: 1829953
the best way to find out is to type 'man cut' in UNIX. cut is a utility which is intended to split strings into parts.
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