shell-exec

I have a python script being called form php's shell_exec command. All works well, except that it cannot import the NLTK corpora when called through shell_exec. The very same command is executed without problems however, whenever I call it directly from shell. I am using Debian 8. This is my php-Code: $cmd = "/usr/bin/python /var/www/include/sCrape.py -u '$my_url' "; $response = shell_exec($cmd); $response = json_decode($response, true); This command works well when called directly (without sudo) from the root: /usr/bin/python /var/www/include/sCrape.py -u '$my_url' The error message from the

Let's say I want to execute the command mycommand with PHP shell_exec() 10 times. Should I do a bash loop: shell_exec('for i in {1 .. 10} do mycommand -i done'); or rather a PHP loop: for($i = 1; $i <=10; ++$i) { shell_exec('mycommand -'.$i); } What are the reasons (security, performance, style, ...) to choose one over the other? Go for bash loop, because shell_exec function is called only once. It will be faster than calling shell_exec multiple times. Enabling functions like exec, shell_exec itself a huge security issue. If someone managed to upload a PHP shell in your server then he can hack

Are shell commands considered a legitimate programming interface? Specifically, is there anything wrong with executing bash shell commands on a linux application server from PHP pages or CGI files? Does this introduce efficiency or security issues? Thanks Sometimes OK, but... Sometimes it's the best way to solve a problem. But possible issues are: Security Look out for code injection if you aren't doing taint checking . Performance Running shell commands will involving forking the PHP interpreter and executing complex and relatively slow system calls . This is OK for a lightly loaded server

In PHP code I try to execute Java program using shell_exec but I get empty line. When I tried to execute program in bash: #bin/bash echo "aaa" I get "aaa" but when i tried to execute the same file with #bin/bash java MainApp I got empty line This is the java code public class MainApp{ public static void main(String[] args) { System.out.print(":]"); } } When i do: #bin/bash echo "aaa" java MainApp echo "bbb" I get "aaa bbb" I wont to get ":]" string How to make it work? Maybe printing line with System.out.println(String ) is not the same as echo and printing line is not the same as returning