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Write a shell script with options

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# 1  
Old 03-20-2012
Write a shell script with options
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

Code:
./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

Moderator's Comments:
Mod Comment Its square brakets for code tags... Smilie
Last edited by vbe; 03-20-2012 at 12:19 PM..
# 2  
Old 03-20-2012
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  
Old 03-20-2012
thanks vbe your suggestions.

No, S and C is not use together. Here no option is used like other
Code:
ls -lrt

.

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

Thanks
Atul Singh
# 4  
Old 03-20-2012
Use a loop with a case statement:

Code:
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  
Old 03-20-2012
Read about getopts. There're lot of posts in this forum on how to use getopts.
# 6  
Old 03-20-2012
thanks guys for your suggestions and ideas.
will read about getopts

thanks
Atul Singh
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