Write a shell script with options

Shell Programming and Scripting
1

Hi All

I am little bit confused to write a script. This script needs the options like unix commands
i.e.

�S to start process.
�C to check process.
-u : user
-p : password

like.

script should run like this

./script.sh -u username -p ***** -S processname

there may be all the options or not. So I am confused how to write this script ??

My Idea :
I want to read all the argument pass and match with the respected details
like if there is -u used so next should be a username or -S then next should be a process name. But this thing needs lot of checks on the arguments only.
and after that I have to call the "case" in the script if there is any specific option in command line.

Please suggest your idea or help me with mine.

thanks
Atul Singh

2

What will it be doing if no argument sent?

Since you are the one writing the script dont accept no agument...and add -h for help...
Can S and C be used together?
how many processes can it "start"?

3

thanks vbe your suggestions.

No, S and C is not use together. Here no option is used like other

ls -lrt

.

In my case if a option is there , its respective value should be there.

Thanks
Atul Singh

4

Use a loop with a case statement:

MODE=""

# Loop until we run out of arguments.
while [ "$#" -gt 0 ]
do
        case "$1" in
        -p)
                shift
                MYPASS="$1"
                ;;
        -u)
                shift
                MYUSER="$1"
                ;;

        -S)
                MODE="start"
                ;;

        -C)
                MODE="check"
                ;;
        *)
                echo "Unknown argument '$1'" >&2
                exit 1
                ;;
        esac

        # Delete $1 argument, set $1=$2, $2=$3, ...
        shift
done

if [ -z "$MODE" ]
then
        echo "Must give -S or -C" >&2
        exit 1
fi

if [ "$MODE" = "check" ]
then
        echo "doing check"
fi

...
5

Read about getopts. There're lot of posts in this forum on how to use getopts.

6

thanks guys for your suggestions and ideas.
will read about getopts

thanks
Atul Singh