Re^2: System commands using CGI

[nikhilB]

Hi rgt, Thanks for the reply. I tried using the following but it looks like the command doesnt get executed from the CGI :

#!/usr/bin/perl
print "content-type: text/html \n\n";
# SET UP THE TABLE
print "<table border='1'>";
print "<th>Test</th><th>Value</th><th>Expected Value</th><th>Result</t
+h>";
$b=`/usr/bin/who>>/root/abcd.txt`;
print "$array[1]\n\n";
#print "VALUE IS $b\n\n";
print "<tr><td>".$b."</td>";

When I run this from the command prompt, it the gives the correct output.

Any idea where I am going wrong ?

Thanks.

[rjt]

Your code here did not generate that output. It was hard to read without <code> tags, so I reformatted it for you:

#!/usr/bin/perl
print "content-type: text/html \n\n";
# SET UP THE TABLE
print "";
print "";
$b=`/usr/bin/who>>/root/abcd.txt`;
print "$array<a href="?node=1">1</a>\n\n"; # <== FIXME
#print "VALUE IS $b\n\n";
print "";

Your code here does not compile. You need to escape the double quotes in your print "$array... line.

Beyond that, however, why in the world are you trying to append the output of /usr/bin/who to /root/abcd.txt? More to the point, please let us know exactly what your CGI program is supposed to do, and perhaps then we can get to the root of the problem (no pun intended... or maybe it was...).

[Anonymous Monk]

A webserver with root access? Doubtful

[bitingduck]

The lack of code tags that rjt pointed out also munges up the formatting of the replies. It looks like the empty print statements in what he posted contain table related tags, like:

#!/usr/bin/perl
print "content-type: text/html \n\n";
# SET UP THE TABLE
print "<table border='1'>";
print "<th>Test</th><th>Value</th><th>Expected Value</th><th>Result</t
+h>";
$b=`/usr/bin/who>>/root/abcd.txt`;
print "$array<a href="?node=1">1</a>\n\n";
#print "VALUE IS $b\n\n";
print "<tr><td>".$b."</td>";

It would make it easier to sort out the replies if you can go back and wrap your code in code tags.