Hello List! What is the securest way of starting a application, like ping, from a webinterface as a diffrent user. Lets say, to run ping 123.456.789.000 as user user123. If i use "system", it executes it as www-data. Any idea how i could solve this problem? With php, perl, bash, etc... ? Thank you very much in advance! Cheers, Mario p.s. i hope i explained it well enough. If not, let me know!