1.TH strlen 3 scc\-VERSION2.SH NAME3strlen - determine the length of a string4.SH SYNOPSIS5#include <string.h>67size_t strlen(const char *s)8.SH DESCRIPTION9The10.BR strlen ()11function counts the number of bytes in the null-terminated string12pointed to by13.IR s ,14not including the terminating null byte.15.SH RETURN VALUE16The number of bytes preceding the terminating null byte in17.I s18is returned.19.SH STANDARDS20ISO/IEC 9899:1999 Section 7.21.6.3