[ Thanks to BlueVoodoo for this link.
]
“… you can often do an editing job at the command line more
quickly than it takes to open the file in a text editor. A complex
editing procedure can be programmed and specified from the command
line and executed across multiple files, eliminating all
unnecessary screen display, cursor motion, and manual interaction
with the files. A good tactic is to keep a cache of relevant
one-liners on hand to do common editing jobs. Not only do they save
you time, especially in batch operations involving multiple files,
but you can also use them in scripts.”