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In my specific case ,I want to use it to dump what I echo.

I don't want to involve any file...

Is there a way to make objdump read from stdin instead?

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Could you please explain your situation a little more? – quanta Nov 9 '11 at 3:36

you can always do

objdump -d /dev/stdin < t2.o


cat t2.o | objdump -d /dev/stdin


[root@myhost cc]# objdump -h /dev/stdin < t2.o

/dev/stdin: file format elf64-x86-64

Sections: Idx Name Size VMA LMA
File off Algn 0 .group 00000008 0000000000000000 0000000000000000 00000040 2**2 CONTENTS, READONLY, EXCLUDE, GROUP, LINK_ONCE_DISCARD

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cat t2.o | objdump -d /dev/stdin does not work. /dev/stdin only works when it corresponds to a real file. Since your solution requires the presence of that file, this does not answer the OP. – dragonroot Nov 9 '12 at 5:04
This may work for this invocation of objdump in particular, but it might fail for others in case it does seek operations on the file. When tools don't have - for stdin, that is often the case. – Ciro Santilli 巴拿馬文件 六四事件 法轮功 Aug 28 '15 at 9:18

You can't. There is no way around that, you will have to use the temporary file.

Source file readelf.c has this unconditional check (in binutils 2.22-8 at least) before even attempting to open the file:

if (! S_ISREG (statbuf.st_mode))
      error (_("'%s' is not an ordinary file\n"), file_name);
      return 1;

So if the file is anything but regular file (like symlink, or char device as in case of /dev/stdin, /proc/self/fd/*, etc.) it won't work.

Alternatively, you could modify the source and use modified objdump, but there goes your portability.

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