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O

• od - dump files in various formats
• open(), openat - open file relative to directory file descriptor
• openat(), open - open file relative to directory file descriptor
• 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

• Object File
• Octet
• Offset Maximum
• Opaque Address
• Open File Description
• Open File
• Operand
• Operator
• Option-Argument
• Option
• Orientation
• Orphaned Process Group
• Other Environment Variables
• Other Language-Related Specifications
• Output Devices and Terminal Types