Uhm, no? I've only seen it in recent CentOS (older versions didn't have it),
and maybe Fedora does this as well.
I think the question is asking you to use /lib/ld.so, but it's a bit of a weird question to ask.
Not really. You can do it in any number of ways, including using
Perl/Python/Ruby, writing a short C program, or overwriting another file with
execution permissions. My favourite way is a surprise to most people only
because they don't know how ELF binaries work.
Most distros symlink /bin to /usr/bin.
>
> Uhm, no? I've only seen it in recent CentOS (older versions didn't have it), and maybe Fedora does this as well.
Arch, Ubuntu, Debian all do it.
Not really. You can do it in any number of ways, including using Perl/Python/Ruby, writing a short C program, or overwriting another file with execution permissions.
Only the last one is a clever solution. "Just write a program" isn't a fun answer. :P
My favourite way is a surprise to most people only because they don't know how ELF binaries work.
What do you mean? They didn't know there's a copy of the same binary?
> Uhm, no? I've only seen it in recent CentOS (older versions didn't have it), and maybe Fedora does this as well.
Arch, Ubuntu, Debian all do it.
I haven't checked Arch, but neither Ubuntu 16.04 nor Debian Jessie haven't
created /bin as a symlink.
> You can do it [restoring execution bit on /bin/chmod] in any number of ways [...]
Only the last one is a clever solution
On interview you don't need to have the most clever answer. It's better to
show you understand the mechanisms underneath by having several sensible ways.
What do you mean? They didn't know there's a copy of the same binary?
Comments
Most distros symlink /bin to /usr/bin. I think the question is asking you to use /lib/ld.so, but it's a bit of a weird question to ask.
Uhm, no? I've only seen it in recent CentOS (older versions didn't have it), and maybe Fedora does this as well.
Not really. You can do it in any number of ways, including using Perl/Python/Ruby, writing a short C program, or overwriting another file with execution permissions. My favourite way is a surprise to most people only because they don't know how ELF binaries work.
Arch, Ubuntu, Debian all do it.
Only the last one is a clever solution. "Just write a program" isn't a fun answer. :P
What do you mean? They didn't know there's a copy of the same binary?
I haven't checked Arch, but neither Ubuntu 16.04 nor Debian Jessie haven't created /bin as a symlink.
On interview you don't need to have the most clever answer. It's better to show you understand the mechanisms underneath by having several sensible ways.
No, I meant this: https://news.ycombinator.com/item?id=11627670
And there is no copy of the same binary.
Odd, I could've sworn they did. I stand corrected.
That's what I said, you use the ELF interpreter. :P