1 example for ed

  # ed - a line editor

# launch ed
ed

# launch ed with a prompt (":")
ed -p:

# ed takes commands within the actual editor
# these are some of the more essential ones
# the prompt from earlier is included to distinguish betwen commands and text

# quit ed
:q

# write a file
:w

# see error description
:h

# globally make errors verbose (lasts until quit)
:H

# edit text
:a

# stop editing text
.

# example of writing one line and going back to command mode
:a
Hello, world!
.
: