TestDisk – CGSecurity
TestDisk is powerful free data recovery software! It was primarily designed to help recover lost partitions and/or make non-booting disks bootable again when these symptoms are caused by faulty software, certain types of viruses or human error (such as accidentally deleting a Partition Table). Partition table recovery using TestDisk is really easy.
To create a PDF file from man pages, open a terminal and type:
man -t linux_command | ps2pdf - linux_command.pdf
where linux_command is the name of the command you need.
Using vi as an hex editor « linux instead
So, open a file in vi as usual, hit escape and type:
to switch into hex mode.
And when your done hit escape again and type:
to exit from hex mode.