get_ip_address: Get the current IP address
In bi-sdal/sdalr: Convenience functions for the Social and Decision Analytics Lab

An example use cause is getting the IP address within a docker container for the user to SSH into in order to run an R script in the background

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get_ip_address(cmd = "ip address",
  ip_pattern = "(\\d{1,3}\\.){3}\\d{1,3}", con_pattern = "eth0",
  verbose = FALSE)

`cmd`	system call that gets the IP address. Defaults to 'ip address'
`ip_pattern`	regex pattern that matches an ip address
`con_pattern`	regex pattern for the device. Defaults to 'eth0'
`verbose`	whether or not to print statments during parsing. Defaults to FALSE