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How to use environment variable in a C program Asked 7 years, 4 months ago Modified 1 year, 9 months ago Viewed 54k times 23 I need to know a way for use environment variables in the C programming language. How can I use and read them? For example, read an environment variable or take the value of an environment variable and load it in another variable. 1 c variables path environment Share Improve this question Follow edited Jun 2, 2017 at 20:06 Peter Mortensen 30.7k 21 104 125 asked Aug 9, 2015 at 16:10 Alex 289 01 02 0 5 I’m voting to close this question as off-topic because Googling exact title gives: ‘About 15,600,000 results’ – Martin James Aug 9, 2015 at 16:23 and now, this is among them. man7.orglinuxman-pagesman3getenv.3.html – erik258 Dec 30, 2017 at 5:31 and not only that, this is 1 in the list 🙂 – Seamus May 21 at 12:31 Add a comment