Uploaded Wed Jun 10 2020 14:31:01

GNU ddrescue data recovery tool copies data
from one file or block device (hard disk,
CD-ROM, etc.) to another, trying to rescue
the good parts first in case of read errors. 
GNU ddrescuelog is a tool that manipulates
ddrescue logfiles, shows logfile contents,
converts logfiles to/from other formats,
compares logfiles, tests rescue status, and
can delete a logfile if the rescue is done. 
www.gnu.org/software/ddrescue/ddrescue.html

Uploaded Wed Jun 10 2020 14:31:01

Uploaded Wed Jun 10 2020 14:31:01

GNU ed is an 8-bit clean implementation of
the POSIX line-oriented text editor.  Ed is
the "standard" text editor in the sense that
it is the original editor for Unix, and thus
widely available.  For most purposes,
however, it is superseded by full-screen
editors such as GNU Emacs or GNU Moe. 
http://www.gnu.org/software/ed/ed.html

Uploaded Wed Jun 10 2020 14:31:01

GNU ed is an 8-bit clean implementation of
the POSIX line-oriented text editor.  Ed is
the "standard" text editor in the sense that
it is the original editor for Unix, and thus
widely available.  For most purposes,
however, it is superseded by full-screen
editors such as GNU Emacs or GNU Moe. 
http://www.gnu.org/software/ed/ed.html