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Pass Arguments to a Bash-Script Example

#! /bin/bash

# $* Returns a single string (``$1, $2 ... $n'') 
# comprising all of the positional parameters
# separated by the internal field separator character 
#(defined by the IFS environment variable).
# $0 Refers to the name of the script itself
echo $0 $1 $2 $3  ' > echo $1 $2 $3'

# $@ Returns a sequence of strings 
# (``$1'', ``$2'', ... ``$n'')
# wherein each positional parameter 
# remains separate from the others.
args=("$@")

echo ${args[0]} ${args[1]} ${args[2]} 

echo $@

# $# Refers to the number of arguments 
# specified on a command line.
echo $#
output:

test@test$ ./hello.sh Mark Tom John
./hello.sh Mark Tom John  > echo $1 $2 $3
Mark Tom John
Mark Tom John
3