Advanced Debugger
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The advanced debugger adb is the standard UNIX debugger found on Solaris 1 and 2, HP-UX and SCO. The initial version has been written by Steve Bourne. It is the successor of a debugger called db.
A version of ADB was integrated into the BSD kernel as a kernel debugger. Today, the kernel debugger in *BSD is the only derivative of ADB still in regular use.
Use of ADB was largely replaced by the symbolic debugger DBX.