What does each column of objdump's Symbol table mean?

Question

SYMBOL TABLE:
0000000000000000  w      *UND*  0000000000000000              __gmon_start__

I\'ve man objdump but there\'s no such info.

Answer 1

objdump -t prints the symbol table entries of the file.
The output is similar to the information provided by the nm program.

There are 7 columns in the output:

• value
• class
• type
• size
• line
• section
• symbol-name

(some columns may be empty for some entries)

objdump prints the symbol-name in left-most column.
nm prints the symbol-name in the right-most column.