"cat /dev/null > ~/.bash_history && history -c && exit"

Command Syntax

find /path/to/files* -mtime +5 -exec rm {} \;

Note that there are spaces between rm, {}, and \;

Explanation

The first argument is the path to the files. This can be a path, a directory, or a wildcard as in the example above. I would recommend using the full path, and make sure that you run the command without the exec rm to make sure you are getting the right results.
The second argument, -mtime, is used to specify the number of days old that the file is. If you enter +5, it will find files older than 5 days.
The third argument, -exec, allows you to pass in a command such as rm. The {} \; at the end is required to end the command.

egrep $(echo $(cat /var/log/mail.log | grep "heo@toto.fr" | awk '{print $6}' | tr -d ':') | sed 's/ /|/g') /var/log/mail.log | sed 's/.removed./&\n/'

Yatta !!!

!/bin/bash

function nextIP {
for i in {"1","2","3","4"};do
eval digit$i=$(echo $1| cut -d'.' -f$i)
done

            for i in {"4","3","2","1"};do
                    if [ $(eval echo "\${digit$i}") -lt 255 ];
                    then
                            let digit$i=$(eval echo "\${digit$i}")+1
                            IP="$digit1.$digit2.$digit3.$digit4"
                            return 0
                    else
                            let digit$i=0
                    fi
            done
            return 1
       }

nextIP $1
echo $IP

So good !

To prevent a command from being added to the history in the first place, make sure that the environment variable HISTCONTROL contains among its colon-separated values the value ignorespace, for example (add e.g. to .bashrc):

$ export HISTCONTROL=ignorespace

This will prevent any command with a leading space from being added to the history. You can then clear the history completely by running

$ history -c -w
^-- additional space character