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# nm
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## 说明
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**nm命令** 被用于显示二进制目标文件的符号表
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## 选项
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```markdown
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用法：nm [选项] [文件]
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列举 [文件] 中的符号 (默认为 a.out)
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-a, --debug-syms Display debugger-only symbols
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-A, --print-file-name 在每个符号之前打印输入文件的名称
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-B Same as --format=bsd
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-C, --demangle[=STYLE] Decode low-level symbol names into user-level names
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The STYLE, if specified, can be `auto' (the default),
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`gnu', `lucid', `arm', `hp', `edg', `gnu-v3', `java'
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or `gnat'
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--no-demangle Do not demangle low-level symbol names
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-D, --dynamic 显示动态符号
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--defined-only Display only defined symbols
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-e (ignored)
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-f, --format=FORMAT Use the output format FORMAT. FORMAT can be `bsd',
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`sysv' or `posix'. The default is `bsd'
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-g, --extern-only 只显示外部符号
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-l, --line-numbers Use debugging information to find a filename and
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line number for each symbol
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-n, --numeric-sort Sort symbols numerically by address
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-o Same as -A
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-p, --no-sort Do not sort the symbols
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-P, --portability Same as --format=posix
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-r, --reverse-sort 反序显示符号表
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--plugin NAME Load the specified plugin
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-S, --print-size Print size of defined symbols
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-s, --print-armap Include index for symbols from archive members
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--size-sort Sort symbols by size
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--special-syms Include special symbols in the output
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--synthetic Display synthetic symbols as well
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-t, --radix=RADIX Use RADIX for printing symbol values
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--target=BFDNAME Specify the target object format as BFDNAME
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-u, --undefined-only Display only undefined symbols
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-X 32_64 (ignored)
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@FILE Read options from FILE
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nm：支持的目标： elf64-x86-64 elf32-i386 elf32-iamcu elf32-x86-64 a.out-i386-linux pei-i386 pei-x86-64 elf64-l1om
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elf64-k1om elf64-little elf64-big elf32-little elf32-big plugin srec symbolsrec verilog tekhex binary ihex
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```
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## 实例
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