[LTP] [PATCH] shell: add echo command check

[Li Wang]

Hi Mataotao,

First, thank you for creating new tests for LTP.

But from what I know LTP now is mainly a face-to-Linux Kernel side test
suite,
rather than the userspace or command line test (it had some but slowly being
removed from the test suite).

'echo' is daily popular used but belongs to the coreutils package, it's not
the core
of kernel part. I guess maintainers have no passion for reviewing patch
like this:(.


-- 
Regards,
Li Wang