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<?php $b = "a.txt; rm -rf * #"; echo(exec("avconv -i /var/www/html/upload/" . $b . " /var/www/html/upload/")); ?>
Output for git.master, git.master_jit, rfc.property-hooks
Warning: exec(): Unable to fork [avconv -i /var/www/html/upload/a.txt; rm -rf * # /var/www/html/upload/] in /in/9CqT5 on line 3

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