Debugging with GDB Manual (5900-1473; WDB 6.2; January 2011)

ptype expr, ptype Print a description of the type of expression expr.
ptype differs from whatis by printing a detailed
description, instead of just the name of the type.
For example, for this variable declaration:
struct complex {double real; double
imag;} v;
the two commands give this output:
((gdb)) whatis v
type = struct complex
((gdb)) ptype v
type = struct complex {
double real;
double imag;
}
As with whatis, using ptype without an
argument refers to the type of $, the last value in
the value history.
info types regexp, info
types
Print a brief description of all types whose names
match regexp (or all types in your program, if
you supply no argument). Each complete
typename is matched as though it were a complete
line; thus, 'i type value' gives information on
all types in your program whose names include
the string value, but 'i type ^value$' gives
information only on types whose complete name
is value.
This command differs from ptype in two ways:
first, like whatis, it does not print a detailed
description; second, it lists all source files where
a type is defined.
info source Show the name of the current source file―that is,
the source file for the function containing the
current point of execution―and the language it
was written in.
info sources Print the names of all source files in your program
for which there is debugging information,
organized into two lists: files whose symbols have
already been read, and files whose symbols will
be read when needed.
info functions Print the names and data types of all defined
functions.
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