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hmm
i don't know why you made a script for this simple php command
but this is well known and used in many scripts.
and all hosting companys wich know a little bit about security runs
their apache software in safemode, so it isn't possible to execute
commands with this.
Hmm well have you actually tried using any kind of script like this?
You can still run commands on the server even if apache is running as nobody or apache, 5 out of 10 times if you find a way to upload it to someones website it will be running as the user who owns that website, so that means you can make changes to whatever files that are in that users home directory, as long as they belong to the user. You can also use this and download a perl script that runs a shell on some port,which would be easier for you to find a local exploit that you could use.