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I

• iconv — codeset conversion
• iconv() — codeset conversion function
• iconv.h — codeset conversion facility
• iconv_close() — codeset conversion deallocation function
• iconv_open() — codeset conversion allocation function
• id — return user identity
• if_freenameindex() — free memory allocated by if_nameindex
• if_indextoname() — map a network interface index to its corresponding name
• if_nameindex() — return all network interface names and indexes
• if_nametoindex() — map a network interface name to its corresponding index
• ilogb(), ilogbf, ilogbl — return an unbiased exponent
• ilogbf(), ilogb, ilogbl — return an unbiased exponent
• ilogbl(), ilogb, ilogbf — return an unbiased exponent
• imaxabs() — return absolute value
• imaxdiv() — return quotient and remainder
• in6addr_any, in6addr_loopback — IPv6 address variables
• in6addr_loopback, in6addr_any — IPv6 address variables
• inet_addr(), inet_ntoa — IPv4 address manipulation
• inet_ntoa(), inet_addr — IPv4 address manipulation
• inet_ntop(), inet_pton — convert IPv4 and IPv6 addresses between binary and text form
• inet_pton(), inet_ntop — convert IPv4 and IPv6 addresses between binary and text form
• initstate(), random, setstate, srandom — pseudo-random number functions
• insque(), remque — insert or remove an element in a queue
• inttypes.h — fixed size integer types
• ipcrm — remove an XSI message queue, semaphore set, or shared memory segment identifier
• ipcs — report XSI interprocess communication facilities status
• isalnum(), isalnum_l — test for an alphanumeric character
• isalnum_l(), isalnum — test for an alphanumeric character
• isalpha(), isalpha_l — test for an alphabetic character
• isalpha_l(), isalpha — test for an alphabetic character
• isatty() — test for a terminal device
• isblank(), isblank_l — test for a blank character
• isblank_l(), isblank — test for a blank character
• iscntrl(), iscntrl_l — test for a control character
• iscntrl_l(), iscntrl — test for a control character
• isdigit(), isdigit_l — test for a decimal digit
• isdigit_l(), isdigit — test for a decimal digit
• isfinite() — test for finite value
• isgraph(), isgraph_l — test for a visible character
• isgraph_l(), isgraph — test for a visible character
• isgreater(), isgreaterequal, isless, islessequal, islessgreater — real-floating relational tests
• isgreaterequal(), isgreater, isless, islessequal, islessgreater — real-floating relational tests
• isinf() — test for infinity
• isless(), isgreater, isgreaterequal, islessequal, islessgreater — real-floating relational tests
• islessequal(), isgreater, isgreaterequal, isless, islessgreater — real-floating relational tests
• islessgreater(), isgreater, isgreaterequal, isless, islessequal — real-floating relational tests
• islower(), islower_l — test for a lowercase letter
• islower_l(), islower — test for a lowercase letter
• isnan() — test for a NaN
• isnormal() — test for a normal value
• iso646.h — alternative spellings
• isprint(), isprint_l — test for a printable character
• isprint_l(), isprint — test for a printable character
• ispunct(), ispunct_l — test for a punctuation character
• ispunct_l(), ispunct — test for a punctuation character
• isspace(), isspace_l — test for a white-space character
• isspace_l(), isspace — test for a white-space character
• isunordered() — test if arguments are unordered
• isupper(), isupper_l — test for an uppercase letter
• isupper_l(), isupper — test for an uppercase letter
• iswalnum(), iswalnum_l — test for an alphanumeric wide-character code
• iswalnum_l(), iswalnum — test for an alphanumeric wide-character code
• iswalpha(), iswalpha_l — test for an alphabetic wide-character code
• iswalpha_l(), iswalpha — test for an alphabetic wide-character code
• iswblank(), iswblank_l — test for a blank wide-character code
• iswblank_l(), iswblank — test for a blank wide-character code
• iswcntrl(), iswcntrl_l — test for a control wide-character code
• iswcntrl_l(), iswcntrl — test for a control wide-character code
• iswctype(), iswctype_l — test character for a specified class
• iswctype_l(), iswctype — test character for a specified class
• iswdigit(), iswdigit_l — test for a decimal digit wide-character code
• iswdigit_l(), iswdigit — test for a decimal digit wide-character code
• iswgraph(), iswgraph_l — test for a visible wide-character code
• iswgraph_l(), iswgraph — test for a visible wide-character code
• iswlower(), iswlower_l — test for a lowercase letter wide-character code
• iswlower_l(), iswlower — test for a lowercase letter wide-character code
• iswprint(), iswprint_l — test for a printable wide-character code
• iswprint_l(), iswprint — test for a printable wide-character code
• iswpunct(), iswpunct_l — test for a punctuation wide-character code
• iswpunct_l(), iswpunct — test for a punctuation wide-character code
• iswspace(), iswspace_l — test for a white-space wide-character code
• iswspace_l(), iswspace — test for a white-space wide-character code
• iswupper(), iswupper_l — test for an uppercase letter wide-character code
• iswupper_l(), iswupper — test for an uppercase letter wide-character code
• iswxdigit(), iswxdigit_l — test for a hexadecimal digit wide-character code
• iswxdigit_l(), iswxdigit — test for a hexadecimal digit wide-character code
• isxdigit(), isxdigit_l — test for a hexadecimal digit
• isxdigit_l(), isxdigit — test for a hexadecimal digit

• 2.1 Implementation Conformance
• 3.172 Incomplete Line
• 3.173 Inf
• 3.174 Interactive Device
• 3.175 Interactive Shell
• 3.176 Internationalization
• 3.177 Interprocess Communication
• 3.178 Intrinsic Utility
• 3.179 Invoke
• 8.2 Internationalization Variables
• 11.1 Interface Characteristics