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Index: U

• UIDs : (see user IDs)
• ul command : How nroff Makes Bold and Underline; How to Remove It
• ulimit -f command : Limiting File Sizes
• umask command
• • Automatic Setup When You Enter/Exit a Directory
  • User, Group, and World
  • Setting an Exact umask
  • Shell Lockfile
  • setting in shell scripts : Subshells
• umask value : Running Install
• uname command
• • How UNIX Systems Remember Their Name
  • Quick Descriptions of What's on the Disc
• unarchiving : (see archives)
• uncluttering logins : Unclutter Logins: Show Login Messages Just Once
• uncompress command
• • Missing Programs
  • Uncompressing the Sources
• undelete program : Quick Descriptions of What's on the Disc
• underlined text : How nroff Makes Bold and Underline; How to Remove It
• underscore (_) in filenames : Filenames
• undoing (vi editor)
• • Get Back What You Deleted with Numbered Buffers
  • Confirming Substitutions in ex and vi
  • Finding Your Place with Undo
• unedit command (SCCS) : SCCS Basics
• unexpand command
• • TAB Is Just Another Character to UNIX
  • Quick Descriptions of What's on the Disc
  • filtering within vi : Keymaps for Pasting into a Window Running vi
• unexpand script : Save Space with Tab Characters
• uniq command
• • Quick Reference: uniq
  • apropos on Systems Without apropos
• UNIX
• • advantages
  • • What's Special About UNIX?
    • Power Grows on You
    • What a Multiuser System Can Do for You
    • Everyone Should Learn Some Shell Developing
    • Shrink-Wrapped Software for UNIX
  • binary programs : Compiling Source Code
  • definition of priority : Know When to Be "nice" to OTher Users...and When
  • drawbacks of : What's Wrong with UNIX
  • flexible handling of TAB characters : How UNIX Handles TAB Characters
  • identifying versions : Which Version Am I Using?
  • networking and communications utilities : UNIX Networking and Communications
  • platforms : Shrink-Wrapped Software for UNIX
  • time on : Which Time Is It?
  • two main branches of : How We Made It This Far (Back?)
  • versions of : About UNIX Versions
• unkillable processes, cleaning up : Cleaning Up an Unkillable Process
• unlimit coredumpsize command : Limiting File Sizes
• unlink command : Using unlink to Remove a File with a Strange Name
• unlinking files : Unlinking Open Files Isn't a Good Idea
• unprintable characters : (see special characters)
• • codes for writing : Special Character Codes
• unprintable files : Page Through Compressed, RCS, Unprintable Files
• unset variable errors : Choosing the Shell Run (We Hope) by at
• unsetenv command : What Environment Variables Are Good For
• unshar program
• • unshar: Unarchive a Shell Archive
  • Quick Descriptions of What's on the Disc
  • Missing Programs
  • Unsharring the Sources
• unshar software : Unsharring the Sources
• untarring software : Untarring the Sources
• unterrupt characters : Setting Your Erase, Kill, and Interrupt Characters
• until loops : Looping Until a Command Succeeds
• • in Bourne shells : Looping Until a Command Succeeds
  • examples : Looping Until a Command Succeeds
  • while loops compared to : Looping Until a Command Fails
• updateb script : Finding Files (Much) Faster with a find Database
• uppercase
• • pathname in : Installing a Single Program
  • without CAPS LOCK : Typing in Uppercase Without CAPS LOCK
• uptime command : Checking System Load: uptime
• • average reported by : The CPU
• Usenet : UNIX Networking and Communications
• $USER
• • examples : Automating Your Own Calendar
• user dictionaries : (see dictionary files)
• USER environment variable
• • Predefined Environment Variables
  • Special C Shell Variables
  • in C shell : Variable Syntax
• user IDs (UIDs) : Managing Processes: Overall Concepts
• • file access : File Access Permissions
• user time
• • Timing Programs
  • Why Is the System So Slow?
• user's login shell, killing : Destroying Processes with kill
• user-defined signal : (see USR1 (user-defined) signal)
• user-state CPU time : Why Is the System So Slow?
• username field in crontab entries : Execution Scheduling
• users
• • Searching by Owner and Group
  • (see also groups)
  • classes of : User Communities
  • effect on system performance : User Communities
  • ownership : (see ownership, file)
  • SUID bit
  • • File Access Permissions
    • Access to Directories
• /usr directory
• • /usr/bin directory
  • • programs in : Internal and External Commands
    • in search paths : Shell Search Paths
  • /usr/include, header files in : Functions, Libraries, and Header Files
  • /usr/lib/crontab file : Execution Scheduling
  • /usr/lib/crontab.local file : Execution Scheduling
  • /usr/local directory : Installing Everything Using the Defaults
  • /usr/tmp directory : Why Both /tmp and /usr/tmp?
• USR1 (user-defined) signal : What Are Signals?
• utilities, combining : Everyone Should Learn Some Shell Developing
• UUCP (UNIX-to-UNIX copy)
• • UNIX Networking and Communications
  • UUCP
• uudecode command : Using tar to Create and Unpack Archives
• uuencode command : Using tar to Create and Unpack Archives
• uuencoded files : My Favorite Is !$
• UUNET : UUCP

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