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O

• od — dump files in various formats
• open(), openat — open file
• openat(), open — open file
• opendir(), fdopendir — open directory associated with file descriptor
• openlog(), closelog, setlogmask, syslog — control system log
• open_memstream(), open_wmemstream — open a dynamic memory buffer stream
• open_wmemstream(), open_memstream — open a dynamic memory buffer stream
• optarg, getopt, opterr, optind, optopt — command option parsing
• opterr, getopt, optarg, optind, optopt — command option parsing
• optind, getopt, optarg, opterr, optopt — command option parsing
• optopt, getopt, optarg, opterr, optind — command option parsing

• 2.4 Other Language-Related Specifications
• 3.235 Object File
• 3.236 Octet
• 3.237 OFD-Owned File Lock
• 3.238 Offset Maximum
• 3.239 Opaque Address
• 3.240 Open File
• 3.241 Open File Description
• 3.242 Operand
• 3.243 Operator
• 3.244 Option
• 3.245 Option-Argument
• 3.246 Orientation
• 3.247 Orphaned Process Group
• 8.3 Other Environment Variables
• 10.2 Output Devices and Terminal Types