如何防止意外rm -rf / *？

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root@localhost:~# #rm -rf /

sachin@sachin-ThinkPad-T420:~$ touch {1..4}
sachin@sachin-ThinkPad-T420:~$ touch -- -i
sachin@sachin-ThinkPad-T420:~$ ls
1  2  3  4  -i
sachin@sachin-ThinkPad-T420:~$ rm -rf *
rm: remove regular empty file `1'? n
rm: remove regular empty file `2'? 

--preserve-root
              do not remove `/' (default)

$ rm -rf /usr
Skipping /usr

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cd ..
mv somedir DELETE-somedir
mkdir somedir                 # or rsync -dgop DELETE-somedir somedir to preserve permissions
ls DELETE-somedir             # just to make sure we're deleting the right thing
rm -rf DELETE-somedir

mkdir ../DELETE_ME
mv * ../DELETE_ME
ls ../DELETE_ME
rm -rf ../DELETE_ME

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what_the_hell_am_i_thinking() {
   echo "Stop." >&2
   echo "Seriously." >&2
   echo "You almost blew up your computer." >&2
   echo 'WHAT WERE YOU THINKING!?!?!' >&2
   echo "Please provide an excuse for yourself below: " 
   read 
   echo "I'm sorry, that's a pathetic excuse. You're fired."
   sleep 2
   telnet nyancat.dakko.us
}

alias rm -fr /*="what_the_hell_am_i_thinking"

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find | less

find . | less

find path/to/files -delete

find path/to/files -name '*~' | less
find path/to/files -name '*~' -delete

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mkdir /tmp/recyclebin

mv target_folder /tmp/recyclebin

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# safety features
alias cp='cp -i'
alias mv='mv -i'
alias rm='rm -I'                    # 'rm -i' prompts for every file
alias ln='ln -i'
alias chown='chown --preserve-root'
alias chmod='chmod --preserve-root'
alias chgrp='chgrp --preserve-root'

#22 楼

alias rm='set -f; myrm' #set -f turns off wildcard expansion need to do it outside of           
                        #the function so that we get the "raw" string.
myrm() {
    ARGV="$*"
    set +f #opposite of set -f
    if echo "$ARGV" | grep -e '-rf /*' \
                           -e 'another scary pattern'
    then
        echo "Do Not Operate Heavy Machinery while under the influence of this medication"
        return 1
    else
        /bin/rm $@
    fi
}

#23 楼

$ cd /
$ sudo safe-rm -rf *
$ ls
bash: /bin/ls: No such file or directory

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$ rmsafe /path/to/important/files

$ alias rm="safe rm"

$ rm /*
Are you sure you want to 'rm /bin /boot /data /dev /etc /home /initrd.img /lib /lib64 /mnt /opt /proc /root /run /sbin /srv /sys /tmp /usr /var'? [y/n]

#26 楼

$ cat /usr/local/bin/saferm

#! /bin/bash

/bin/ls -- "$@"

echo "Those be the files you're about to delete."
echo "Do you want to proceed (y/N)?"

read userresponse

if [ "$userresponse" -eq "y" ]; then

  echo "Executing...."
  /bin/rm -- "$@"

fi

alias rm="/usr/local/bin/saferm"

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