emulating rm command - Shell Programming and Scripting

jack1981 · #1 07-06-2006

Hi everyone!

I am trying to write a bash script to emulate the rm command, I want to save all files I delete, a bit like the recycle bin in a windows OS. My script so far is below, I still need to amend a few things, once complete I plan to alias the script to rm and use it as a safe delete method so I don't mess up and delete an important file, the thing is the part I call flow control at the bottom, its real messy and could go on forever, I want to allow for proper rm precedence when using options, can anyone give me advice on how to make a function to manage any options and arguments and reduce the amount of code I have at the bottom?

Any help or comments would be great.

Also, this is my first post so please to meet everyone!

Jack

Code:

#!/bin/bash
# program to emulate the "rm" command in UNIX.


#  CREATE TRASH FOLDER

if ! [ -d "$HOME/deleted" ] ; then
     mkdir $HOME/deleted
fi

# INITIALIZE VARIABLES

NO_ARGS=0
FLAG_R=0
FLAG_F=0
FLAG_I=0
FLAG_V=0
TRASH=$HOME/deleted


# FUNCTIONS

function errorInvalidOpt() {

    echo "rm: invalid option - $o"
    echo "try \`rm -help\` for more information"
    exit 0
}


function errorTooFew() {

   echo "rm: too few arguments"
   echo "try \`rm --help\` for more information"
}

function errorNoSuch() {

   echo "rm: cannot remove $* : no such file or directory"
}

function okDelete() {

echo -n "rm: remove $* ?"
    read ANSWER
    if [ "$ANSWER" = "y" ] ; then
    mv $@ $TRASH
fi
}

function notifyDelete() {

if  [ -f  ] ; then
   echo "removing \`$*'"
   mv $@ $TRASH

fi
}

function  okNotify() {

echo -n "rm: remove $* ?"
    read ANSWER
    if [ "$ANSWER" = "y" ] ; then
    notifyDelete $@

fi
}

function delete() {
   if ! [ -f ] ; then
   errorNoSuch;
   else
   mv  $@ $TRASH
fi
}


# GETOPTS

while getopts :rRfvi o
do    case $o in

           r|R) FLAG_R=1 ;;
             f) FLAG_F=1 ;;
             v) FLAG_V=1 ;;
             i) FLAG_I=1 ;;
             *) errorInvalidOpt

      esac
done
shift `expr $OPTIND - 1`

# FLOW CONTROL

if [ "$#" -eq "$NO_ARGS" ] ; then
   errorTooFew

elif [ $FLAG_R -eq  0 ] && [ $FLAG_F -eq 0 ] && [ $FLAG_I -eq 0 ] && [ $FLAG_V -eq 0 ] ; then
   delete $@

elif [ $FLAG_R -eq  1 ] && [ $FLAG_F -eq 1 ] && [ $FLAG_I -eq 1 ] && [ $FLAG_V -eq 1 ] ; then
   okNotify $@

elif [ $FLAG_R -eq  1 ] && [ $FLAG_F -eq 1 ] && [ $FLAG_I -eq 1 ] ; then
   okNotify $@

elif [ $FLAG_F -eq 1 ] && [ $FLAG_I -eq 1 ] && [ $FLAG_V -eq 1 ] ; then
   okNotify $@

elif [ $FLAG_R -eq  1 ] && [ $FLAG_I -eq 1 ] && [ $FLAG_V -eq 1 ] ; then
   okNotify $@

elif [ $FLAG_R -eq  1 ] && [ $FLAG_V -eq 1 ] ; then
   notifyDelete $@

elif [ $FLAG_V -eq 1 ] && [ $FLAG_I -eq 1 ] ; then
   okNotify $@

elif [ $FLAG_F -eq 1 ] && [ $FLAG_I -eq 1 ] ; then
   notifyDelete $@

elif [ $FLAG_R -eq 1 ] ; then
   delete $@

elif [ $FLAG_V -eq 1 ] ; then
   notifyDelete $@

elif [ $FLAG_I -eq 1 ] ; then
   okDelete $@

elif [ $FLAG_F -eq 1 ] ; then
   delete $@
fi

Hitori · #2 07-06-2006

This may help you:

Code:

#!/bin/sh

set -- `getopt "abco:" "$@"`

a= b= c= o=
while :
do
    case "$1" in
    -a) a=1;;
    -b) b=1;;
    -c) c=1;;
    -o) shift; o="$1";;
    --) break;;
    esac
shift
done
shift # get rid of --
# rest of script...
# e.g.
ls -l $@

WARNING: spaces in filenames

It's better to use perl (more safe) and getopts() function in Getopt::Std

Even better is to change the code of original rm and make a hard link to ~/.trash/filename before unlink the file

jack1981 · #3 07-06-2006

Quote:

Originally Posted by Hitori

This may help you:

Code:

#!/bin/sh

set -- `getopt "abco:" "$@"`

a= b= c= o=
while :
do
    case "$1" in
    -a) a=1;;
    -b) b=1;;
    -c) c=1;;
    -o) shift; o="$1";;
    --) break;;
    esac
shift
done
shift # get rid of --
# rest of script...
# e.g.
ls -l $@

WARNING: spaces in filenames

It's better to use perl (more safe) and getopts() function in Getopt::Std

Even better is to change the code of original rm and make a hard link to ~/.trash/filename before unlink the file

Hi,

Thanks for reply, will that give the last option precedence when there is a contradiction of options though?

I am using getops also, I have the script working a bit better but I am stock on precedence.

Thanks again

Mike

jack1981 · #4 07-06-2006

got it working, like so:

Code:

#!/bin/bash
# program to emulate the "rm" command in UNIX.
# less the endless sp

#  CREATE TRASH FOLDER

if ! [ -d "$HOME/deleted" ] ; then
     mkdir $HOME/deleted
fi

# INITIALIZE VARIABLES
OPT=-
NO_ARGS=0
FLAG_R=""
FLAG_F=""
FLAG_I=""
FLAG_V=""
TRASH=$HOME/deleted


# FUNCTIONS

function errorInvailidOpt() {

    echo "rm: invalid option - $o"
    echo "try \`rm -help\` for more information"
    exit 0
}


function errorTooFew() {

   echo "rm: too few arguments"
   echo "try \`rm --help\` for more information"
}

function errorNoSuch() {

   echo "rm: cannot remove $* : no such file or directory"
}


function writePro () {
echo -n "rm: remove write-protected file \`$*'?"
read ANSWER
    if [ "$ANSWER" = "y" ] &&  [ "$FLAG_V" = "v" ] ; then
    mv $OPTS $@ $TRASH 2>/dev/null
    echo "removing \`$*'"
    else
    mv $OPTS $@ $TRASH 2>/dev/null

fi
}

function verbose () {
mv $@ $TRASH 2>/dev/null
echo "removing \`$*'"
}
function intVerbose () {
echo -n "rm: remove $* ?"
    read ANSWER
    if [ "$ANSWER" = "y" ] ; then
    mv  $@ $TRASH 2>/dev/null
    echo "removing \`$*'"


fi
}

function int () {
echo -n "rm: remove $* ?"
    read ANSWER
    if [ "$ANSWER" = "y" ] ; then
    mv  $@ $TRASH 2>/dev/null
fi
}

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

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

# FLOW CONTROL

OPTS=$FLAG_R$FLAG_F$FLAG_I$FLAG_V

if [ "$#" -eq "$NO_ARGS" ] ; then
   errorTooFew $@
elif ! [ -f  "$1" ] &&  ! [ -d "$1" ]; then
   errorNoSuch $@
elif ! [ -w  "$1" ] ; then
   writePro $@
else
   delete $@
fi

olimiles · #5 08-23-2006

Thats a really useful script Jack, saved me quite a few times now

Did you by any chance finish it so that it does all the directories stuff? ie the

Code:

rm -ir foldername

?

Thanks in advance,

Oliver

System Shock · #6 08-23-2006

Wouldn't it be just easier to simply use the mv command to move the files to whatever you designate the trash directory? Why go thorugh all of the rm simulation pain when essentially what you want to do is move a file from one directory to another?

Hitori · #7 08-23-2006

If you do not want that users remove their files accidentally, then just do not give execution rights on rm command

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