read text file in linux c (content is only more ip) and set network configuration [on hold]

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http://stackoverflow.com – I have a text file named get-ip.txt I want to write a C program that can read this file and i want to set network config by them (assume the file contains only more ip in multi line). I don't know how to get the text file and read each ip in line to set network configuratin tanx.plz helppppp (HowTos)