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U

• ualarm - set the interval timer
• ucontext - user context
• ulimit - get and set process limits
• ulimit - set or report file size limit (XCU)
• ulimit.h - ulimit commands
• umask - get or set the file mode creation mask
• umask - set and get file mode creation mask (XCU)
• unalias - remove alias definitions
• uname - get name of current system
• uname - return system name (XCU)
• uncompress - expand compressed data
• unctrl - generate printable representation of a character
• unctrl.h - definitions for unctrl()
• unexpand - convert spaces to tabs
• unget - undo a previous get of an SCCS file (DEVELOPMENT)
• ungetc - push byte back into input stream
• ungetch, unget_wch - push a character onto the input queue
• 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 - call the unlink function (XCU)
• unlink - remove a directory entry
• unlockpt - unlock a pseudo-terminal master/slave pair
• unset - Unset Values and Attributes of Variables and Functions (Shell Built-in)
• unpack - expand files (LEGACY)
• untouchwin - window refresh control function
• use_env - specify source of screen size information
• usleep - suspend execution for an interval
• utime - set file access and modification times
• utime.h - access and modification times structure
• utimes - set file access and modification times
• utmpx.h - user accounting database definitions
• uucp - system-to-system copy
• uudecode - decode a binary file
• uuencode - encode a binary file
• uulog - query system-to-system transaction log (LEGACY)
• uuname - list names of other known uucp systems (LEGACY)
• uupick - receive public system-to-system file copies (LEGACY)
• uustat - uucp status inquiry and job control
• uuto - send public system-to-system file copies (LEGACY)
• uux - remote command execution

• upshifting
• Use and Implementation of Interfaces
• user database
• user ID
• user name
• utility
• Utility Conventions
• Utility Argument Syntax
• Utility Syntax Guidelines