setting precedence with getopts

jack1981 · #1 (**permalink**) 07-13-2006

Hi,

I am re-writing a script I wrote which emulated the "rm" command, in my orginal script I had problems with precedence, I did find a way round it by creating a seperate case statements which checked the options and performed the actions accordingly, does anyone know if I can use getopts better to help with precedence? and save on using the extra case statement.

So instead of this part of my code:

Code:


function delete() {
while :
do  case $OPTS in

      v|ivf|vf|ifv|vif) verbose $@
                      break
                      ;;
    fi|vfi|fvi|iv|vi|fiv) intVerbose $@
                      break
                      ;;
               f|fv|if) mv -f $@ $TRASH 2>/dev/null
                      break
                      ;;
                     i) int $@
                      break
                      ;;
                     r)mv $@ $TRASH 2>/dev/null
                      break
                      ;;
                     *)mv $@ $TRASH 2>/dev/null
                      break

esac
done

}


# GETOPTS

while getopts :rRfvi o
do    case $o in
           r|R) FLAG_R=
             ;;
             f) FLAG_F=f
             ;;
             v) FLAG_V=v
             ;;
             i) FLAG_I=i
             ;;
             *) errorInvalidOpt

      esac
done
shift `expr $OPTIND - 1`

OPTS=$FLAG_R$FLAG_F$FLAG_I$FLAG_V

I can manage it within getopts by just using this:

Code:


while getopts :rRfvi o
do    case $o in
           r|R) FLAG_R=r    #what can I add to my getopts to set the right flags
             ;;                   #  in order with rm's precedence
             f) FLAG_F=f        
             ;;
             v) FLAG_V=v
             ;;
             i) FLAG_I=i
             ;;
             *) errorInvalidOpt

      esac
done
shift `expr $OPTIND - 1`

I have ommitted the rest of my code but I am trying to emulate the "rm" and I am providing other functions to move the files to a trash folder rather than delete for good.

So, given this option argument: -fi it should not force but should interact but if I enter -if it should not interact but should force, how do I utilise getopts to allow for this withour the case statement in the top code?

Thanks

Jack

aigles · #2 (**permalink**) 07-17-2006

You can do somthiong like this :

Code:

while getopts :rRfvi o
do    case $o in
           r|R) FLAG_R=r    #what can I add to my getopts to set the right flags
             ;;                   #  in order with rm's precedence
             f) FLAG_F=f
                FLAG_I=        
             ;;
             v) FLAG_V=v
             ;;
             i) FLAG_I=i
                FLAG_F=
             ;;
             *) errorInvalidOpt

      esac
done
shift `expr $OPTIND - 1`

Jean-Pierre.

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