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It's achieved in the shell by using a shell. C isn't a shell, and a file really isn't a variable, you often don't know how long it is... You have to convert yourself and worry about any special...

popen("command, "r") with fgets() is really the C moral equivalent of somevariable=`command`

what somevariable=` ` does in pseudoC

open FILE *in
fork new child & wait
run
exec bin/sh...