[Freeswitch-users] How to set FS variable to the value returned by linux command

Hello, I run the same config on multiple boxes. Need to tell apart which box CDR is coming from without setting it manually per-box. Is there a way to set a global variable to the output of linux 'hostname -s' command? E.g. instead of: <X-PRE-PROCESS cmd="set" data="sbc_hostname=sbc1"/> <X-PRE-PROCESS cmd="set" data="sbc_hostname=sbc2"/> ..... <X-PRE-PROCESS cmd="set" data="sbc_hostname=sbcN"/> I need something like: <X-PRE-PROCESS cmd="set" data="'hostname -s'"/>\ Thank you, -Victor