Re: enabling ELF, command not found

Werner, Roger NAVAIR wrote:
> Ah, yes.  Apparently it is.  However, I have an ELF binary which reports 
> a "command-not-found" error when we try to run it.  Examination of the 
> binary reveals strings "libm.so.5" and "libld-linux.so.1".  I don't have 
> either in /usr/lib.  Does their mention in the executable imply that 
> they are needed at runtime, and if so, where would one get them?
> 
> The "command not found" error also suggests to me a possible scenario 
> such as a system(<command>); statement somewhere within the program, and 
> perhaps it is that command which is not found.  Unfortunately, I do not 
> have the source code, so I expect that standard debuggers would not help 
> me to determine what command is not found.  Is there a way to find out 
> WHAT command is not found?  (sometimes I've run into a similar error 
> when a script starts with something like #!/bin/sh or #!/bin/ksh and 
> that file doesn't exist on the system.)
> 
> Could the version of linux be relevant?  and if so, is there a way I 
> could tell from the binary what version it needs to run on?
> 
> roger

A quick look at rpmfind.net shows that Red Hat 6.2 had libc-5.3.12-31 
which provided libm.so.5.  These are old libraries, because even Red Hat 
5.1 had these libraries, and called them old ;o) "libld-linux.so.1" 
didn't turn up anything, but ld-linux.so.1 did (ld.so-1.9.5-13 for Red 
Hat 6.2).  It looks like you need a Red Hat 6.2 CD and you should be 
able to install the packages that it needs.  You should also try `ldd 
binary` (where binary is the program that you are trying to run).  That 
may show you other libraries that it needs.

Forrest
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