strings命令是在对象文件或者二进制文件中查找可打印的字符串，有很多的用途，例如一个用法就是在编译的so中定义字符串常量作为动态库的版本号，然后就可以使用strings+grep 组合命令查看当前编译的so的版本号了。
输入strings -h查看strings命令的用法：
用法：strings [选项] [文件]
打印 [文件] (默认为标准输入) 中可打印的字符串
选项为：
-a - --all Scan the entire file, not just the data section [default]
-d --data Only scan the data sections in the file
-f --print-file-name Print the name of the file before each string
-n --bytes=[number] Locate & print any NUL-terminated sequence of at
- least [number] characters (default 4).
-t --radix={o,d,x} Print the location of the string in base 8, 10 or 16
-w --include-all-whitespace Include all whitespace as valid string characters
-o An alias for --radix=o
-T --target= Specify the binary file format
-e --encoding={s,S,b,l,B,L} Select character size and endianness:
s = 7-bit, S = 8-bit, {b,l} = 16-bit, {B,L} = 32-bit
-s --output-separator= String used to separate strings in output.
@ Read options from
-h --help Display this information
-v -V --version Print the program's version number
strings：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 elf64-k1om elf64-little elf64-big elf32-little elf32-big pe-x86-64 pe-bigobj-x86-64 pe-i386 plugin srec symbolsrec verilog tekhex binary ihex
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