How do i use positional parameters in a bash shell script?

[shoebill]

These are positional parameters.

$0, $1, $2, $3, $4, $5, $6, $7, $8, and $9

$0 is the name of the script, $1 - S9 are positional parameters to the script.

echo $0
echo $1
echo $2
echo $3

Even if the positional parameter is blank, it prints and empty line.

$ ./params.sh
./params.sh

With parameters the output is:

$ ./params.sh one two three
./params.sh
one
two
three

Just echoing the positional parameters is useful in some cases but, they are mostly used in combination with conditional statements and tests.