-b byte
–byte= byte
Keep only every byte of the input file (header data is not affected). byte can be
in the range from 0 to interleave-1, where interleave is given by the -i or
–interleave option, or the default of 4. This option is useful for creating files to
program ROM . It is typically used with an srec output target.
-i interleave
–interleave= interleave （interleave 隔行、交叉）
Only copy one out of every interleave bytes. Select which byte to copy with the
-b or –byte option. The default is 4. objcopy ignores this option if you do not
specify either -b or –byte.
–change-addresses incr
–adjust-vma incr
Change the VMA and LMA addresses of all sections, section., as well as the
start address, by adding incr. Some object file formats do not permit section
addresses to be changed arbitrarily.
–set-section-flags section=flags
为section的段设置一个标识。这个flags变量的可以取逗号分隔的多个标识名字符串（这些标识名字符串是能够被Objcopy程序所识别的），合法的标识名有alloc，load，readonly，code，data和rom。
You can set the contents flag for a section which does not havecontents, but it is not meaningful to clear the contents flag of a section which does have contents; just remove the section instead. Not all flags are meaningful for all object file formats.
–change-leading-char
Some object file formats use special characters at the start of symbols. The most
common such character is underscore, which compilers often add before every
symbol. This option tells objcopy to change the leading character of every
symbol when it converts between object file formats. If the object file formats use
the same leading character, this option has no effect. Otherwise, it will add a
character, or remove a character, or change a character, as appropriate.
–remove-leading-char
If the first character of a global symbol is a special symbol leading character used
by the object file format, remove the character. The most common symbol leading
character is underscore. This option will remove a leading underscore from all
global symbols. This can be useful if you want to link together objects of different
file formats with different conventions for symbol names.
–weaken
Change all global symbols in the file to be weak. This can be useful when building
an object that will be linked against other objects using the -R option to the linker.
This option is only effective when using an object file format that supports weak
symbols.
-V
–version
Show the version number of objcopy.
-v
–verbose
Verbose output: list all object files modified. In the case of archives, objcopy -V
lists all members of the archive.
$ ls -l
drwxrwxrwx 2 sam adm 4096 10月 30 20:14 file6
-rwxrwxrwx 2 sam adm 0 10月 31 01:01 http3.conf
-rwxrwxrwx 2 sam adm 0 10月 31 01:01 httpd.conf
$ find . -perm -7 -print | xargs chmod o-w
$ ls -l
drwxrwxr-x 2 sam adm 4096 10月 30 20:14 file6
-rwxrwxr-x 2 sam adm 0 10月 31 01:01 http3.conf
-rwxrwxr-x 2 sam adm 0 10月 31 01:01 httpd.conf
用grep命令在所有的普通文件中搜索hostname这个词：
123
$ find . -type f -print | xargs grep 'hostname'
./httpd1.conf:# different IP addresses or hostnames and have them handled by the
./httpd1.conf:# VirtualHost: If you want to maintain multiple domains/hostnames on your
用grep命令在当前目录下的所有普通文件中搜索hostnames这个词：
123
$ find . -name \* -type f -print | xargs grep 'hostnames'
./httpd1.conf:# different IP addresses or hostnames and have them handled by the
./httpd1.conf:# VirtualHost: If you want to maintain multiple domains/hostnames on your
