Bash command line parameters

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examples/bash/hello_foo.sh

#!/usr/bin/env bash

echo "Hello $1"

$1 $2 $3
$*      which is $1 $2 $3 ...   but that splits up the spaces that might be inside $1 or $2 ..
"$*"    is the same
$@      is the same but
"$@"    is "$1" "$2" "$3" ...