NOTES USING ED

ed is a line-oriented text editor that's both simple and 
powerful. I find it very fun to write with, and I like how 
it integrates well within other unix tools. This place is 
where I write about things I learn to improve my text 
editing with ed.

============================================================
UNDERLINE DATES

To add "---" after every line matching a date:

  g/^2...-..-../a\
  ----------

============================================================
ADD A SEPARATOR

1. have a script in your PATH that looks like that:
   printf "$1%.0s" $(seq 60)

2. if you want to insert the separator after the title 
(line 1):
   r1 !sep =

============================================================
HARD WRAP LINES

  e !fold -s -w60 %
  w

To simplify things further, add a script to your PATH 
called f60 that does the following:

  fold -s -w60 $1

That way, simply run: e !f60 %.

============================================================
JOIN LINES

  s/$/ /
  j

Then just s and j until all lines are joined.

============================================================
ERASE LINE

If you start to write a line or a command, and you want to 
completely delete it, use <CONTROL> + u.

============================================================
SCRIPTING

Invoke ed the following way:

  ed "!ls -r | grep '^[0-9]\{8\}'" < atom.ed

where atom.ed is your list of instruction. The file doesn't 
need to end with .ed.