Execute perl in PHP

Possible Duplicate: Calling Perl script from PHP and passing in variables, while also using variablized perl script name I want to execute a perl script through PHP. I use `exec()` to execute the perl script. It works in my machine but does not work on the server. The Server is based on CentOS Linux. I gave full permission (777) to both the PHP and the perl script file. When I try to execute, I get the following error in error_log ``` sh: /perl: No such file or directory ``` I tried to execute using the following ways ``` exec("perl -w Script.pl $username $password",$output); exec("/usr/bin/perl -w Script.pl $username $password",$output); exec("/usr/bin/perl Script.pl $username $password",$output); ``` I also tried by using the `system` function ``` $output = system("perl Script.pl $username $password"); ``` Nothing happening when I try this. I also tried to execute perl by using the `passthru()` function ``` passthru("/usr/bin/perl -w Script.pl $username $password",$output); ``` When I execute this line, `$output` prints 127 and nothing happens in the script. I checked whether file is executable or not with the `is_executable()` function. It shows that the file is not executable. Code as below ``` $file = 'Script.pl'; if (is_executable($file)) { echo $file.' is executable'; } else { echo $file.' is not executable'; } ``` If I execute perl through the terminal, it works fine but when I try to execute through PHP, it is not working.