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U

• ualarm() - set the interval timer
• ucontext.h - user context
• ulimit() - get and set process limits
• ulimit - set or report file size limit (Utilities)
• ulimit.h - ulimit commands
• umask() - set and get file mode creation mask
• umask - get or set the file mode creation mask (Utilities)
• unalias - remove alias definitions
• uname() - get name of current system
• uname - return system name (Utility)
• uncompress - expand compressed data
• unexpand - convert spaces to tabs
• ungetc() - push byte back into input stream
• unget - undo a previous get of an SCCS file (DEVELOPMENT)
• ungetwc() - push wide-character code back into input stream
• uniq - report or filter out repeated lines in a file
• unistd.h - standard symbolic constants and types
• unlink() - remove a directory entry
• unlink - call the unlink function (Utility)
• unlockpt() - unlock a pseudo-terminal master/slave pair
• unset - unset values and attributes of variables and functions
• unsetenv() - remove environment variable
• usleep() - suspend execution for an interval
• utime.h - access and modification times structure
• utime() - set file access and modification times
• utimes() - set file access and modification times (LEGACY)
• utmpx.h - user accounting database definitions
• uucp - system-to-system copy
• uudecode - decode a binary file
• uuencode - encode a binary file
• uustat - uucp status inquiry and job control
• uux - remote command execution

• Unbind
• Unit Data
• Upshifting
• User Database
• User ID
• User Name
• User Trace Event
• Utility
• Utility (General Concept)
• Utility Argument Syntax
• Utility Conventions
• Utility Syntax Guidelines