Shell Programming and Scripting

Modified version of the script to process the input parameters in order:
Notice the use of "shift" to cause each parameter in turn to be called $1 .

Code:

#!/bin/sh

a=$#    #number or parameters
b=0      #starting counter

while [ $a -gt $b ]
do
   b=`expr $b + 1`
   echo "Parameter $b is $1"
   shift
done

./scriptname a b c
Parameter 1 is a
Parameter 2 is b
Parameter 3 is c

I just learned that I also could use getopts.

"getopts" is a good solution. It relies on a structured command line which follows normal unix syntax. No problem with that.
Each parameter starts with a hyphen character and can have an optional parameter value.

e.g. A script with two parameters called "-v" and "-z". The parameter "-v" has a value of "myvalue". The parameter "-z" does not have an associated value.

Code:

myscript -v myvalue -z