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U

• uchar.h — Unicode character handling
• ulimit — report or set resource limits
• umask — get or set the file mode creation mask
• umask() — set and get the file mode creation mask
• unalias — remove alias definitions
• uname — return system name
• uname() — get the name of the current system
• uncompress, compress, zcat — compress and decompress data
• unexpand — convert spaces to tabs
• unget — undo a previous get of an SCCS file (DEVELOPMENT)
• ungetc() — push byte back into input stream
• ungetwc() — push wide-character code back into the input stream
• uniq — report or filter out repeated lines in a file
• unistd.h — standard symbolic constants and types
• unlink — call the unlink function
• unlink(), unlinkat — remove a directory entry
• unlinkat(), unlink — remove a directory entry
• unlockpt() — unlock a pseudo-terminal manager/subsidiary pair
• unset — unset values and attributes of variables and functions
• unsetenv() — remove an environment variable
• uselocale() — use locale in current thread
• utimensat(), futimens, utimes — set file access and modification times
• utimes(), futimens, utimensat — 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
• uustat — uucp status enquiry and job control
• uux — remote command execution

• 3.404 Unbind
• 3.405 Unit Data
• 3.406 Upshifting
• 3.407 User Database
• 3.408 User ID
• 3.409 User Name
• 3.410 Utility
• 4.25 Utility
• 12. Utility Conventions
• 12.1 Utility Argument Syntax
• 12.2 Utility Syntax Guidelines