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Thanks a gigaton ! It really was of great help. I will just mention what I have understood.

A backslash removes any special meaning of the symbol succeeding it. If there is no special symbol (like...

I'm very sorry, I didn't mention the fact that I was using bash. So, the examples u gave don't give me the results that u mention. My question is :
eval echo \\h
eval echo \\\h
both give output as...

Thanks. I get that since all the special symbols like |,",',; all are evaluated before substitution takes place. Hence, in the case of $cmd, since no specia symbols were initially found, cmd was...

Thanks a lot !

What's the use of parenthesis () in shell programming ?
I saw this in one of the posts in this forum :
echo $($1)
What confounded me was that it evaluated the inner expression and then the outer...

cmd='date | wc' or cmd="date | wc"
$cmdIf this script is executed, an error is generated. The reason written was that "The execution fails because the pipe is not expanded and is passed to date as...

I can't understand why inserting 4 backslashes instead of 2 or 3 worked