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Take a look at these posts, I hope they are useful:
[1] Basic RE under Linux - http://hypervion.blogspot.com/2012/07/basic-reverse-engineering-for-study.html
[2] GDB and DWARF standard under Linux - http://hypervion.blogspot.com/2012/07/using-gdb-and-dwarf-standard-for.html
[3] Debugging under Linux - http://hypervion.blogspot.com/2012/06/asm-and-debugging-on-linux-what-is-deal.html
hexedit tool or Bless Hex Editor (GUI) should do the job to change opcodes.
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