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authorK. Richard Pixley <rich@cygnus>1992-12-08 04:59:31 +0000
committerK. Richard Pixley <rich@cygnus>1992-12-08 04:59:31 +0000
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-_dnl__ Copyright (c) 1988 1989 1990 1991 Free Software Foundation, Inc.
-_dnl__ This file is part of the source for the GDB manual.
-@c M4 FRAGMENT: $Id$
-@node Sequences, Emacs, Controlling _GDBN__, Top
-@chapter Canned Sequences of Commands
-
-Aside from breakpoint commands (@pxref{Break Commands}), _GDBN__ provides two
-ways to store sequences of commands for execution as a unit:
-user-defined commands and command files.
-
-@menu
-* Define:: User-Defined Commands
-* Command Files:: Command Files
-* Output:: Commands for Controlled Output
-@end menu
-
-@node Define, Command Files, Sequences, Sequences
-@section User-Defined Commands
-
-@cindex user-defined command
-A @dfn{user-defined command} is a sequence of _GDBN__ commands to which you
-assign a new name as a command. This is done with the @code{define}
-command.
-
-@table @code
-@item define @var{commandname}
-@kindex define
-Define a command named @var{commandname}. If there is already a command
-by that name, you are asked to confirm that you want to redefine it.
-
-The definition of the command is made up of other _GDBN__ command lines,
-which are given following the @code{define} command. The end of these
-commands is marked by a line containing @code{end}.
-
-@item document @var{commandname}
-@kindex document
-Give documentation to the user-defined command @var{commandname}. The
-command @var{commandname} must already be defined. This command reads
-lines of documentation just as @code{define} reads the lines of the
-command definition, ending with @code{end}. After the @code{document}
-command is finished, @code{help} on command @var{commandname} will print
-the documentation you have specified.
-
-You may use the @code{document} command again to change the
-documentation of a command. Redefining the command with @code{define}
-does not change the documentation.
-
-@item help user-defined
-@kindex help user-defined
-List all user-defined commands, with the first line of the documentation
-(if any) for each.
-
-@item info user
-@itemx info user @var{commandname}
-@kindex info user
-Display the _GDBN__ commands used to define @var{commandname} (but not its
-documentation). If no @var{commandname} is given, display the
-definitions for all user-defined commands.
-@end table
-
-User-defined commands do not take arguments. When they are executed, the
-commands of the definition are not printed. An error in any command
-stops execution of the user-defined command.
-
-Commands that would ask for confirmation if used interactively proceed
-without asking when used inside a user-defined command. Many _GDBN__ commands
-that normally print messages to say what they are doing omit the messages
-when used in a user-defined command.
-
-@node Command Files, Output, Define, Sequences
-@section Command Files
-
-@cindex command files
-A command file for _GDBN__ is a file of lines that are _GDBN__ commands. Comments
-(lines starting with @kbd{#}) may also be included. An empty line in a
-command file does nothing; it does not mean to repeat the last command, as
-it would from the terminal.
-
-@cindex init file
-@cindex @file{_GDBINIT__}
-When you start _GDBN__, it automatically executes commands from its
-@dfn{init files}. These are files named @file{_GDBINIT__}. _GDBN__
-reads the init file (if any) in your home directory and then the init
-file (if any) in the current working directory. (The init files are not
-executed if you use the @samp{-nx} option; @pxref{Mode Options}.) You
-can also request the execution of a command file with the @code{source}
-command:
-
-@table @code
-@item source @var{filename}
-@kindex source
-Execute the command file @var{filename}.
-@end table
-
-The lines in a command file are executed sequentially. They are not
-printed as they are executed. An error in any command terminates execution
-of the command file.
-
-Commands that would ask for confirmation if used interactively proceed
-without asking when used in a command file. Many _GDBN__ commands that
-normally print messages to say what they are doing omit the messages
-when called from command files.
-
-@node Output, , Command Files, Sequences
-@section Commands for Controlled Output
-
-During the execution of a command file or a user-defined command, normal
-_GDBN__ output is suppressed; the only output that appears is what is
-explicitly printed by the commands in the definition. This section
-describes three commands useful for generating exactly the output you
-want.
-
-@table @code
-@item echo @var{text}
-@kindex echo
-@c I don't consider backslash-space a standard C escape sequence
-@c because it's not in ANSI.
-Print @var{text}. Nonprinting characters can be included in @var{text}
-using C escape sequences, such as @samp{\n} to print a newline. @b{No
-newline will be printed unless you specify one.} In addition to the
-standard C escape sequences, a backslash followed by a space stands for a
-space. This is useful for outputting a string with spaces at the
-beginning or the end, since leading and trailing spaces are otherwise
-trimmed from all arguments. Thus, to print @samp{@ and foo =@ }, use the
-command @samp{echo \@ and foo = \@ }.
-@c FIXME: verify hard copy actually issues enspaces for '@ '! Will this
-@c confuse texinfo?
-
-A backslash at the end of @var{text} can be used, as in C, to continue
-the command onto subsequent lines. For example,
-
-@example
-echo This is some text\n\
-which is continued\n\
-onto several lines.\n
-@end example
-
-produces the same output as
-
-@example
-echo This is some text\n
-echo which is continued\n
-echo onto several lines.\n
-@end example
-
-@item output @var{expression}
-@kindex output
-Print the value of @var{expression} and nothing but that value: no
-newlines, no @samp{$@var{nn} = }. The value is not entered in the
-value history either. @xref{Expressions} for more information on
-expressions.
-
-@item output/@var{fmt} @var{expression}
-Print the value of @var{expression} in format @var{fmt}. You can use
-the same formats as for @code{print}; @pxref{Output formats}, for more
-information.
-
-@item printf @var{string}, @var{expressions}@dots{}
-@kindex printf
-Print the values of the @var{expressions} under the control of
-@var{string}. The @var{expressions} are separated by commas and may
-be either numbers or pointers. Their values are printed as specified
-by @var{string}, exactly as if the program were to execute
-
-@example
-printf (@var{string}, @var{expressions}@dots{});
-@end example
-
-For example, you can print two values in hex like this:
-
-@example
-printf "foo, bar-foo = 0x%x, 0x%x\n", foo, bar-foo
-@end example
-
-The only backslash-escape sequences that you can use in the format
-string are the simple ones that consist of backslash followed by a
-letter.
-@end table