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A

• iconv_close() - codeset conversion deallocation function
• iconv - codeset conversion
• iconv() - codeset conversion function
• iconv.h - codeset conversion facility
• 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
• imaxabs() - return absolute value
• imaxdiv() - return quotient and remainder
• index() - character string operations (LEGACY)
• inet_addr(), inet_ntoa - IPv4 address manipulation
• inet_ntoa() - IPv4 address manipulation
• inet_ntop(), inet_pton - 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
• ioctl() - control a STREAMS device (STREAMS)
• ipcrm - remove an XSI message queue, semaphore set, or shared memory segment identifier
• ipcs - report XSI interprocess communication facilities status
• isalnum() - test for an alphanumeric character
• isalpha() - test for an alphabetic character
• isascii() - test for a 7-bit US-ASCII character
• isastream() - test a file descriptor (STREAMS)
• isatty() - test for a terminal device
• isblank() - test for a blank character
• iscntrl() - test for a control character
• isdigit() - test for a decimal digit
• isfinite() - test for finite value
• isgraph() - test for a visible character
• isgreaterequal() - test if x greater than or equal to y
• isgreater() - test if x greater than y
• isinf() - test for infinity
• islessequal() - test if x is less than or equal to y
• islessgreater() - test if x is less than or greater than y
• isless() - test if x is less than y
• islower() - test for a lowercase letter
• isnan() - test for a NaN
• isnormal() - test for a normal value
• iso646.h - alternative spellings
• isprint() - test for a printable character
• ispunct() - test for a punctuation character
• isspace() - test for a white-space character
• isunordered() - test if arguments are unordered
• isupper() - test for an uppercase letter
• iswalnum() - test for an alphanumeric wide-character code
• iswalpha() - test for an alphabetic wide-character code
• iswblank() - test for a blank wide-character code
• iswcntrl() - test for a control wide-character code
• iswctype() - test character for a specified class
• iswdigit() - test for a decimal digit wide-character code
• iswgraph() - test for a visible wide-character code
• iswlower() - test for a lowercase letter wide-character code
• iswprint() - test for a printable wide-character code
• iswpunct() - test for a punctuation wide-character code
• iswspace() - test for a white-space wide-character code
• iswupper() - test for an uppercase letter wide-character code
• iswxdigit() - test for a hexadecimal digit wide-character code
• isxdigit() - test for a hexadecimal digit

• Implementation Conformance
• Incomplete Line
• Inf
• Instrumented Application
• Interactive Shell
• Internationalization
• Internationalization Variables
• Interprocess Communication
• Invoke