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2.9.2 The TTY Inspector

If X is unavailable, a terminal inspector is invoked. The TTY inspector is a crude interface to describe which allows objects to be traversed and maintains a history. This inspector prints information about and object and a numbered list of the components of the object. The command-line based interface is a normal read–eval–print loop, but an integer n descends into the n’th component of the current object, and symbols with these special names are interpreted as commands:

U

Move back to the enclosing object. As you descend into the components of an object, a stack of all the objects previously seen is kept. This command pops you up one level of this stack.

Q, E

Return the current object from inspect.

R

Recompute object display, and print again. Useful if the object may have changed.

D

Display again without recomputing.

H, ?

Show help message.