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Use the If command to evaluate an expression and then, depending on the
results, execute a list of commands.  The format of the If command is:


     IF <expr> { <command> }
     [ ELSEIF <expr> { <command> } [ ELSEIF <expr> { <command> } [...]]]
     [ELSE { <command> }]

If the expression results in a non-zero value, the list of debugger commands
contained after the IF expression are executed.  Otherwise, the list of
commands that appear after the ELSEIF expression are executed.