&lt;address-history-token&gt; [if &lt;expr&gt;]
stop at [&lt;file:]&lt;line&gt; [if &lt;expr&gt;]
stop &lt;address&gt; [if &lt;expr&gt;]</PRE>
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This is the main command to use when setting breakpoints in C programs. The &quot;stop in&quot; command will set a breakpoint at the beginning of a procedure, immediately after the procedure's stack frame has been set up. The &quot;stop at&quot; command will set a breakpoint at the first instruction of the given source line. If no &lt;file&gt; is specified, the s