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Info file gdb.info, produced by Makeinfo, -*- Text -*- from input file gdb-all.texi. This file documents the GNU debugger GDB. Copyright (C) 1988, 1989, 1990, 1991 Free Software Foundation, Inc. Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided also that the section entitled "GNU General Public License" is included exactly as in the original, and provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Permission is granted to copy and distribute translations of this manual into another language, under the above conditions for modified versions, except that the section entitled "GNU General Public License" may be included in a translation approved by the Free Software Foundation instead of in the original English. File: gdb.info, Node: Copying, Next: Index, Prev: Installing GDB, Up: Top GNU GENERAL PUBLIC LICENSE ************************** Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 675 Mass Ave, Cambridge, MA 02139, USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble ======== The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it. For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights. We protect your rights with two steps: (1) copyright the software, and (2) offer you this license which gives you legal permission to copy, distribute and/or modify the software. Also, for each author's protection and ours, we want to make certain that everyone understands that there is no warranty for this free software. If the software is modified by someone else and passed on, we want its recipients to know that what they have is not the original, so that any problems introduced by others will not reflect on the original authors' reputations. Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that redistributors of a free program will individually obtain patent licenses, in effect making the program proprietary. To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all. The precise terms and conditions for copying, distribution and modification follow. TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION 1. This License applies to any program or other work which contains a notice placed by the copyright holder saying it may be distributed under the terms of this General Public License. The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 2. You may copy and distribute verbatim copies of the Program's source code as you receive it, in any medium, provided that you conspicuously and appropriately publish on each copy an appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this License and to the absence of any warranty; and give any other recipients of the Program a copy of this License along with the Program. You may charge a fee for the physical act of transferring a copy, and you may at your option offer warranty protection in exchange for a fee. 3. You may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions: a) You must cause the modified files to carry prominent notices stating that you changed the files and the date of any change. b) You must cause any work that you distribute or publish, that in whole or in part contains or is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third parties under the terms of this License. c) If the modified program normally reads commands interactively when run, you must cause it, when started running for such interactive use in the most ordinary way, to print or display an announcement including an appropriate copyright notice and a notice that there is no warranty (or else, saying that you provide a warranty) and that users may redistribute the program under these conditions, and telling the user how to view a copy of this License. (Exception: if the Program itself is interactive but does not normally print such an announcement, your work based on the Program is not required to print an announcement.) These requirements apply to the modified work as a whole. If identifiable sections of that work are not derived from the Program, and can be reasonably considered independent and separate works in themselves, then this License, and its terms, do not apply to those sections when you distribute them as separate works. But when you distribute the same sections as part of a whole which is a work based on the Program, the distribution of the whole must be on the terms of this License, whose permissions for other licensees extend to the entire whole, and thus to each and every part regardless of who wrote it. Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely by you; rather, the intent is to exercise the right to control the distribution of derivative or collective works based on the Program. In addition, mere aggregation of another work not based on the Program with the Program (or with a work based on the Program) on a volume of a storage or distribution medium does not bring the other work under the scope of this License. 4. You may copy and distribute the Program (or a work based on it, under Section 2) in object code or executable form under the terms of Sections 1 and 2 above provided that you also do one of the following: a) Accompany it with the complete corresponding machine-readable source code, which must be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, b) Accompany it with a written offer, valid for at least three years, to give any third party, for a charge no more than your cost of physically performing source distribution, a complete machine-readable copy of the corresponding source code, to be distributed under the terms of Sections 1 and 2 above on a medium customarily used for software interchange; or, c) Accompany it with the information you received as to the offer to distribute corresponding source code. (This alternative is allowed only for noncommercial distribution and only if you received the program in object code or executable form with such an offer, in accord with Subsection b above.) The source code for a work means the preferred form of the work for making modifications to it. For an executable work, complete source code means all the source code for all modules it contains, plus any associated interface definition files, plus the scripts used to control compilation and installation of the executable. However, as a special exception, the source code distributed need not include anything that is normally distributed (in either source or binary form) with the major components (compiler, kernel, and so on) of the operating system on which the executable runs, unless that component itself accompanies the executable. If distribution of executable or object code is made by offering access to copy from a designated place, then offering equivalent access to copy the source code from the same place counts as distribution of the source code, even though third parties are not compelled to copy the source along with the object code. 5. You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. Any attempt otherwise to copy, modify, sublicense or distribute the Program is void, and will automatically terminate your rights under this License. However, parties who have received copies, or rights, from you under this License will not have their licenses terminated so long as such parties remain in full compliance. 6. You are not required to accept this License, since you have not signed it. However, nothing else grants you permission to modify or distribute the Program or its derivative works. These actions are prohibited by law if you do not accept this License. Therefore, by modifying or distributing the Program (or any work based on the Program), you indicate your acceptance of this License to do so, and all its terms and conditions for copying, distributing or modifying the Program or works based on it. 7. Each time you redistribute the Program (or any work based on the Program), the recipient automatically receives a license from the original licensor to copy, distribute or modify the Program subject to these terms and conditions. You may not impose any further restrictions on the recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance by third parties to this License. 8. If, as a consequence of a court judgment or allegation of patent infringement or for any other reason (not limited to patent issues), conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not distribute the Program at all. For example, if a patent license would not permit royalty-free redistribution of the Program by all those who receive copies directly or indirectly through you, then the only way you could satisfy both it and this License would be to refrain entirely from distribution of the Program. If any portion of this section is held invalid or unenforceable under any particular circumstance, the balance of the section is intended to apply and the section as a whole is intended to apply in other circumstances. It is not the purpose of this section to induce you to infringe any patents or other property right claims or to contest validity of any such claims; this section has the sole purpose of protecting the integrity of the free software distribution system, which is implemented by public license practices. Many people have made generous contributions to the wide range of software distributed through that system in reliance on consistent application of that system; it is up to the author/donor to decide if he or she is willing to distribute software through any other system and a licensee cannot impose that choice. This section is intended to make thoroughly clear what is believed to be a consequence of the rest of this License. 9. If the distribution and/or use of the Program is restricted in certain countries either by patents or by copyrighted interfaces, the original copyright holder who places the Program under this License may add an explicit geographical distribution limitation excluding those countries, so that distribution is permitted only in or among countries not thus excluded. In such case, this License incorporates the limitation as if written in the body of this License. 10. The Free Software Foundation may publish revised and/or new versions of the General Public License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. Each version is given a distinguishing version number. If the Program specifies a version number of this License which applies to it and "any later version", you have the option of following the terms and conditions either of that version or of any later version published by the Free Software Foundation. If the Program does not specify a version number of this License, you may choose any version ever published by the Free Software Foundation. 11. If you wish to incorporate parts of the Program into other free programs whose distribution conditions are different, write to the author to ask for permission. For software which is copyrighted by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions for this. Our decision will be guided by the two goals of preserving the free status of all derivatives of our free software and of promoting the sharing and reuse of software generally. NO WARRANTY 12. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 13. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. END OF TERMS AND CONDITIONS Applying These Terms to Your New Programs ========================================= If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms. To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. ONE LINE TO GIVE THE PROGRAM'S NAME AND A BRIEF IDEA OF WHAT IT DOES. Copyright (C) 19YY NAME OF AUTHOR This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. Also add information on how to contact you by electronic and paper mail. If the program is interactive, make it output a short notice like this when it starts in an interactive mode: Gnomovision version 69, Copyright (C) 19YY NAME OF AUTHOR Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details. The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, the commands you use may be called something other than `show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your program. You should also get your employer (if you work as a programmer) or your school, if any, to sign a "copyright disclaimer" for the program, if necessary. Here is a sample; alter the names: Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision' (which makes passes at compilers) written by James Hacker. SIGNATURE OF TY COON, 1 April 1989 Ty Coon, President of Vice This General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Library General Public License instead of this License. File: gdb.info, Node: Index, Prev: Copying, Up: Top Index ***** * Menu: * #: Command Syntax. * $_: Set Breaks. * $_: Machine Code. * $_: Memory. * $__: Memory. * ::: Variables. * @: Arrays. * $$: Value History. * $: Value History. * .gdbinit: Command Files. * AMD EB29K: Target Commands. * Bug Criteria: Bug Criteria. * Bug Reports: Bug Reporting. * Bugs in GDB: GDB Bugs. * C++: Cplusplus. * C++ exception handling: Cplusplus commands. * C++ name resolution: Variables. * C++ symbol display: Cplusplus commands. * Core Dump: Bug Criteria. * EB29K board: EB29K Remote. * EBMON: Comms (EB29K). * Fatal Signal: Bug Criteria. * GDB Bugs, Reporting: Bug Reporting. * GDB reference card: Formatting Manual. * GNU C++: Cplusplus. * INCLUDE_RDB: VxWorks Remote. * Invalid Input: Bug Criteria. * Nindy: i960-Nindy Remote. * RET: Command Syntax. * Reporting Bugs in GDB: GDB Bugs. * VxWorks: VxWorks Remote. * abbreviation: Command Syntax. * active targets: Active Targets. * add-symbol-file: Files. * add-syms: Renamed Commands. * arguments (to your program): Arguments. * artificial array: Arrays. * assignment: Assignment. * attach: Attach. * attach: Attach. * automatic display: Auto Display. * b: Set Breaks. * backtrace: Backtrace. * break: Set Breaks. * break in overloaded functions: Cplusplus commands. * breakpoint commands: Break Commands. * breakpoint conditions: Conditions. * breakpoints: Breakpoints. * bt: Backtrace. * call: Calling. * call overloaded functions: Cplusplus expressions. * call stack: Stack. * calling functions: Calling. * calling make: Shell Commands. * catch: Exception Handling. * catch exceptions: Frame Info. * cd: Working Directory. * clear: Delete Breaks. * clearing breakpoints, watchpoints: Delete Breaks. * colon-colon: Variables. * command files: Command Files. * command line editing: Editing. * commands: Break Commands. * commands for C++: Cplusplus commands. * comment: Command Syntax. * condition: Conditions. * conditional breakpoints: Conditions. * configuring GDB: Installing GDB. * confirmation: Messages/Warnings. * continue: Continuing and Stepping. * continue COUNT: Conditions. * continuing: Continuing and Stepping. * controlling terminal: Input/Output. * convenience variables: Convenience Vars. * core: Files. * core dump file: Files. * core-file: Files. * d: Delete Breaks. * debugging target: Targets. * define: Define. * delete: Delete Breaks. * delete breakpoints: Delete Breaks. * delete display: Auto Display. * delete environment: Renamed Commands. * deleting breakpoints, watchpoints: Delete Breaks. * detach: Attach. * directories for source files: Source Path. * directory: Source Path. * dis: Disabling. * disable: Disabling. * disable breakpoints: Disabling. * disable display: Auto Display. * disabled breakpoints: Disabling. * disassemble: Machine Code. * display: Auto Display. * display of expressions: Auto Display. * do: Selection. * document: Define. * down: Selection. * down-silently: Selection. * download to Nindy-960: Files. * download to VxWorks: VxWorks download. * dynamic linking: Files. * eb.log: Remote Log. * echo: Output. * editing: Editing. * emacs: Emacs. * enable: Disabling. * enable breakpoints: Disabling. * enable display: Auto Display. * enabled breakpoints: Disabling. * end: Break Commands. * entering numbers: Numbers. * environment (of your program): Environment. * error on Valid Input: Bug Criteria. * examining data: Data. * examining memory: Memory. * exception handlers: Exception Handling. * exception handlers: Frame Info. * exec-file: Files. * executable file: Files. * exiting GDB: Leaving GDB. * expressions: Expressions. * expressions in C++: Cplusplus expressions. * f: Selection. * fatal signals: Signals. * file: Files. * finish: Continuing and Stepping. * flinching: Messages/Warnings. * floating point: Floating Point Hardware. * floating point registers: Registers. * foo: Symbol Errors. * format options: Print Settings. * formatted output: Output formats. * forward-search: Search. * frame: Selection. * frame: Frames. * frame number: Frames. * frame pointer: Frames. * frameless execution: Frames. * g++: Cplusplus. * h: Help. * handle: Signals. * handling signals: Signals. * help: Help. * help target: Target Commands. * help user-defined: Define. * history expansion: History. * history file: History. * history number: Value History. * history save: History. * history size: History. * history substitution: History. * i: Help. * i/o: Input/Output. * i960: i960-Nindy Remote. * ignore: Conditions. * ignore count (of breakpoint): Conditions. * info: Help. * info address: Symbols. * info all-registers: Registers. * info args: Frame Info. * info breakpoints: Set Breaks. * info catch: Frame Info. * info convenience: Renamed Commands. * info copying: Renamed Commands. * info directories: Renamed Commands. * info display: Auto Display. * info editing: Renamed Commands. * info f: Frame Info. * info files: Files. * info float: Floating Point Hardware. * info frame: Frame Info. * info functions: Symbols. * info history: Renamed Commands. * info line: Machine Code. * info locals: Frame Info. * info program: Stopping. * info registers: Registers. * info s: Backtrace. * info set: Help. * info share: Files. * info sharedlibrary: Files. * info signals: Signals. * info source: Symbols. * info sources: Symbols. * info stack: Backtrace. * info target: Files. * info targets: Renamed Commands. * info terminal: Input/Output. * info types: Symbols. * info user: Define. * info values: Renamed Commands. * info variables: Symbols. * info version: Renamed Commands. * info warranty: Renamed Commands. * info watchpoints: Set Watchpoints. * inheritance: Cplusplus commands. * init file: Command Files. * initial frame: Frames. * innermost frame: Frames. * inspect: Data. * installation: Installing GDB. * interrupt: Leaving GDB. * jump: Jumping. * kill: Kill Process. * l: List. * linespec: List. * list: List. * load: Files. * log file for EB29K: Remote Log. * lost output: Break Commands. * make: Shell Commands. * member functions: Cplusplus expressions. * multiple targets: Active Targets. * n: Continuing and Stepping. * namespace in C++: Cplusplus expressions. * next: Continuing and Stepping. * nexti: Continuing and Stepping. * ni: Continuing and Stepping. * number representation: Numbers. * online documentation: Help. * outermost frame: Frames. * output: Output. * output formats: Output formats. * overloading: Breakpoint Menus. * overloading in C++: Cplusplus commands. * path: Environment. * pauses in output: Screen Size. * pipes: Starting. * print: Data. * print settings: Print Settings. * printf: Output. * printing data: Data. * printsyms: Symbols. * prompt: Prompt. * ptype: Symbols. * pwd: Working Directory. * q: Leaving GDB. * quit: Leaving GDB. * raise exceptions: Exception Handling. * rbreak: Set Breaks. * readline: Editing. * redirection: Input/Output. * reference card: Formatting Manual. * reference declarations: Cplusplus expressions. * registers: Registers. * regular expression: Set Breaks. * reloading symbols: Messages/Warnings. * remote debugging: Remote. * repeating commands: Command Syntax. * reset: Nindy reset. * resuming execution: Continuing and Stepping. * return: Returning. * returning from a function: Returning. * reverse-search: Search. * run: Starting. * running: Starting. * running 29K programs: EB29K Remote. * running VxWorks tasks: VxWorks attach. * s: Continuing and Stepping. * search: Search. * searching: Search. * selected frame: Stack. * set: Assignment. * set addressprint: Renamed Commands. * set args: Arguments. * set array-max: Renamed Commands. * set arrayprint: Renamed Commands. * set asm-demangle: Renamed Commands. * set caution: Renamed Commands. * set complaints: Messages/Warnings. * set confirm: Messages/Warnings. * set demangle: Renamed Commands. * set editing: Editing. * set environment: Environment. * set height: Screen Size. * set history expansion: History. * set history filename: History. * set history save: History. * set history size: History. * set history write: Renamed Commands. * set prettyprint: Renamed Commands. * set print address: Print Settings. * set print array: Print Settings. * set print asm-demangle: Print Settings. * set print demangle: Print Settings. * set print elements: Print Settings. * set print object: Print Settings. * set print pretty: Print Settings. * set print union: Print Settings. * set print vtbl: Print Settings. * set prompt: Prompt. * set radix: Numbers. * set screen-height: Renamed Commands. * set screen-width: Renamed Commands. * set sevenbit-strings: Renamed Commands. * set symbol-reloading: Messages/Warnings. * set unionprint: Renamed Commands. * set variable: Assignment. * set verbose: Messages/Warnings. * set vtblprint: Renamed Commands. * set width: Screen Size. * setting variables: Assignment. * setting watchpoints: Set Watchpoints. * share: Files. * shared libraries: Files. * sharedlibrary: Files. * shell: Shell Commands. * shell escape: Shell Commands. * show: Help. * show addressprint: Renamed Commands. * show args: Arguments. * show array-max: Renamed Commands. * show arrayprint: Renamed Commands. * show asm-demangle: Renamed Commands. * show caution: Renamed Commands. * show commands: History. * show complaints: Messages/Warnings. * show confirm: Messages/Warnings. * show convenience: Convenience Vars. * show copying: Help. * show demangle: Renamed Commands. * show directories: Source Path. * show editing: Editing. * show environment: Environment. * show height: Screen Size. * show history: History. * show history write: Renamed Commands. * show paths: Environment. * show prettyprint: Renamed Commands. * show print address: Print Settings. * show print array: Print Settings. * show print asm-demangle: Print Settings. * show print demangle: Print Settings. * show print elements: Print Settings. * show print object: Print Settings. * show print pretty: Print Settings. * show print union: Print Settings. * show print vtbl: Print Settings. * show prompt: Prompt. * show radix: Numbers. * show screen-height: Renamed Commands. * show screen-width: Renamed Commands. * show sevenbit-strings: Renamed Commands. * show unionprint: Renamed Commands. * show values: Value History. * show verbose: Messages/Warnings. * show version: Help. * show vtblprint: Renamed Commands. * show warranty: Help. * show width: Screen Size. * si: Continuing and Stepping. * signal: Signaling. * signals: Signals. * silent: Break Commands. * size of screen: Screen Size. * source: Command Files. * source path: Source Path. * stack frame: Frames. * stacking targets: Active Targets. * starting: Starting. * step: Continuing and Stepping. * stepi: Continuing and Stepping. * stepping: Continuing and Stepping. * stupid questions: Messages/Warnings. * symbol overloading: Breakpoint Menus. * symbol table: Files. * symbol-file: Files. * target: Targets. * target amd-eb: Target Commands. * target core: Target Commands. * target exec: Target Commands. * target nindy: Target Commands. * target remote: Target Commands. * target vxworks: Target Commands. * tbreak: Set Breaks. * terminal: Input/Output. * this: Cplusplus expressions. * tty: Input/Output. * type conversions in C++: Cplusplus expressions. * u: Continuing and Stepping. * undisplay: Auto Display. * unset: Renamed Commands. * unset environment: Environment. * until: Continuing and Stepping. * up: Selection. * up-silently: Selection. * user-defined command: Define. * value history: Value History. * variable name conflict: Variables. * variable values, wrong: Variables. * variables, setting: Assignment. * version number: Help. * watch: Set Watchpoints. * watchpoints: Breakpoints. * whatis: Symbols. * where: Backtrace. * word: Memory. * working directory (of your program): Working Directory. * wrong values: Variables. * x: Memory.