在Linux对rm进行优化，避免误删文件

#!/bin/sh

# newrm, a replacement for the existing rm command, provides a
#   rudimentary unremove capability by creating and utilizing a new
#   directory within the user's home directory. It can handle directories
#   of content as well as individual files, and if the user specifies
#   the -f flag files are removed and NOT archived.

# Big Important Warning: You'll want a cron job or something similar to keep
#   the trash directories tamed. Otherwise nothing will ever actually
#   be deleted from the system and you'll run out of disk space!

mydir="$HOME/.deleted-files"
realrm="/bin/rm"
copy="/bin/cp -R"

if [ $# -eq 0 ] ; then # let 'rm' ouptut the usage error
  exec $realrm # our shell is replaced by /bin/rm
fi

# Parse all options looking for '-f'

flags=""

while getopts "dfiPRrvW" opt
do
  case $opt in
    f) exec $realrm "$@"      ;;  # exec lets us exit this script directly.
    *) flags="$flags -$opt"   ;;  # other flags are for 'rm', not us
  esac
done
shift $(($OPTIND - 1))

# Make sure that the $mydir exists

if [ ! -d $mydir ] ; then
  if [ ! -w $HOME ] ; then
    echo "$0 failed: can't create $mydir in $HOME" >&2
    exit 1
  fi
  mkdir $mydir
  chmod 700 $mydir      # a little bit of privacy, please
fi

for arg
do
  newname="$mydir/$(date "+%S.%M.%H.%d.%m").$(basename "$arg")"
  if [ -f "$arg" ] ; then
    $copy "$arg" "$newname"
  elif [ -d "$arg" ] ; then
    $copy "$arg" "$newname"
  fi
done

exec $realrm $flags "$@"        # our shell is replaced by realrm

alias rm=yourpath/newrm