How to accept command line arguments from a shell script

#!/bin/bash

# A simple copy script

cp $1 $2

# Let's verify the copy worked

echo Details for $2

ls -lh $2

$0 - The name of the Bash script.

$1 - $9 - The first 9 arguments to the Bash script. (As mentioned above.)

$# - How many arguments were passed to the Bash script.

$@ - All the arguments supplied to the Bash script.

$? - The exit status of the most recently run process.

$$ - The process ID of the current script.

$USER - The username of the user running the script.

$HOSTNAME - The hostname of the machine the script is running on.

$SECONDS - The number of seconds since the script was started.

$RANDOM - Returns a different random number each time is it referred to.

$LINENO - Returns the current line number in the Bash script.

references:

https://ryanstutorials.net/bash-scripting-tutorial/bash-variables.php#arguments