I'm confused with the result of the following script:
cmd="echo abc | grep abc"
echo $($cmd)
it's output in my linux box is :
abc | grep abc
It seems that the command substitution treats the cmd's value as one
command unit(not two commands combined with '|') with arguments
separated by whitespace. Why? If it is because the quoting, I think it
should  treats the whole string as a command name, just as :
echo $("echo abc | grep abc")
Can somebody explain it? Thanks.

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"hantechs@gmail.com" <hantechs@gmail.com> writes:

> I'm confused with the result of the following script:
> cmd="echo abc | grep abc"

[snip]

> It seems that the command substitution treats the cmd's value as one
> command unit

You didn't use command substitution. You used simple (weak) quotes.

Change " to `



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