Bash Special Symbols

$0 : Name of Script
$1-$9 & ${10}-${n} : Arguments

All Command Line Arguments
$*: Returns all the arguments. All the values are returned as a single string. IFS (Internal File Descriptor) can be used to change the space between the words
$@: Returns all the arguments. All the values are returned as separate strings

$@ can be converted to an array: args=($@)
arr=() is used to declare an array

The output of

Special Symbols
$#: Returns the total number of arguments that are present
#?: Returns the exit status of the last command
#!: Returns id of the last command
$$: Print PID of the script
$_: Last argument of the previous command