#include <string.h> int strncmp(const char *s1, const char *s2, size_t max);
This function compares up to max characters of s1 and s2.
Zero if the strings are equal, a positive number if s1 comes after s2 in the ASCII collating sequense, else a negative number.
ANSI, POSIX
if (strncmp(arg, "-i", 2) == 0) do_include();
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