Linux User and Programmer's Manual - Manpages
Manual pages starting with i.iconv_close iconv_open iconv if_freenameindex if_indextoname if_nameindex if_nametoindex ilogbf ilogbl ilogb imaxabs imaxdiv index inet_addr inet_ntoa inet_ntop inet_pton initstate insque ioctl isalnum isalpha isascii isastream isatty isblank iscntrl isdigit isfinite isgraph isgreaterequal isgreater isinf islessequal islessgreater isless islower isnan isnormal isprint ispunct isspace isunordered isupper iswalnum iswalpha iswblank iswcntrl iswctype iswdigit iswgraph iswlower iswprint iswpunct iswspace iswupper iswxdigit isxdigit