Backup
tar cz -C / var/www > /usr/backup/var_ww_$(date +%y%m%d).tar

for a in `ls -1 *.tar.gz`; do tar -zxvf $a; done

Creare il file .vimrc nella home directory, e inserire
syntax onnoremap <Space> <PageDown>

Osx: lookupd -flushcacheLinux: ‘/etc/rc.d/init.d/nscd restart’Windows: ipconfig /flushdns