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You create the pipe after you fork. The pipe the child gets, and the pipe the parent gets, are created independently hence not the same pipe. There will be no communication between parent and...

Why are you putting 'echo' in there? It's not necessary. I just used 'echo' as an example -- the positional parameter gets fed into echo instead of the number itself.

When I say $((N+2)), I...

For anyone reading Corona's code and not knowing bash's ${!pattern}:
${!N} uses the ! pattern matching operator that expands to any variable with the
same name as the value of the variable, in...

It's best to avoid eval if at all possible. If you don't consider its implications very carefully, it can be used to inject arbitrary code inside your program.

You can't directly substitute into...

or array (bash example)

#!/bin/bash
#example usage: ./thisfile.shl 1 2 3
echo "Parameters are $@"
declare -a parms=("$@")
i=2
echo ${parms[i]}

You could use eval. For example:
# cat x.sh
#!/bin/ksh
z=1
x=$(( $z + 2 ))
y=$(eval echo \${${x}})
echo $y
# ./x.sh 1111 2222 3333
3333