Ten Commands Every Linux Developer Should Know
This is a more advanced tool and is not for the faint of heart. It's sort of a data-mining tool for object files. A treasure trove of information is encoded inside your object code, and this tool lets you see it. One useful thing this tool can do is dump assembly code mixed with source lines, something gcc -S doesn't do for some reason. Your object code must be compiled with debug (-g) for this to work:
objdump --demangle --source myobject.o
objdump also can help extract binary data from a core file for postmortem debug when you don't have access to a debugger. A complete example is too long for this article, but you need the virtual address from nm or obdump -t. Then, you can dump the file offsets for each virtual address with objdump -x. Finally, objdump is able to read from non-ELF file formats that gdb and other tools can't touch.
This article is not intended as a definitive reference but as a starting point to help you become more productive. Each one of these commands is well documented in the Linux man and info pages. Consult them for more information and more ideas.
Resources for this article: /article/7658.
John Fusco is a software developer with General Electric Healthcare (formerly GE Medical Systems), where he designs Linux software and device drivers for GE's Lightspeed series of Computed Tomography scanners (www.gemedicalsystems.com/rad/ct/products/light_series/index.html).
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August 27, 2015
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