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There are special variables that contain other information from DejaGnu. Your test cases can inspect these variables, as well as the variables saved in site.exp. These variables should never be changed.
$prms_id
The bug tracking system (eg. PRMS/GNATS) number identifying a corresponding bug report (0 if you do not specify it).
$bug_id
An optional bug ID, perhaps a bug identification number from another organization (0 if you do not specify it).
$subdir
The subdirectory for the current test case.
$exec_output
This is the output from a ${tool}_load
command. This only
applies to tools like GCC and GAS which produce an object file that must
in turn be executed to complete a test.
$comp_output
This is the output from a ${tool}_start
command. This is
conventionally used for batch-oriented programs, like GCC and GAS, that
may produce interesting output (warnings, errors) without further
interaction.
$expect_out(buffer)
The output from the last command. This is an internal variable set by Expect. More information can be found in the Expect manual.