If you really want to zap a file in Linux and be sure that it can’t be ever recovered, use the shred command. shred -u -z -v filename will not only delete the file but also overwrite the sectors it resided in 25 times, making recovery impossible.
You can protect your most important files from accidental deletion by giving them a “sticky bit” attribute: chmod +t filename
If you have a server where you have to generate new passwords daily, the following script can automate the process: #!/usr/bin/perl my @alphanumeric = (‘a’..’z’, ‘A’..’Z’, 0..9); my $randpassword = join ”, map $alphanumeric[rand @alphanumeric], 0..8; print “$passwordgen\n” Run it with ./passwordgen.pl and it will generate random strings of charaters and numerals, 8 characters long:… Read More »