From the sed man page: Normally, sed cyclically copies a line of input, not including its terminating newline character, into a pattern space, (unless there is something left after a “D” function), applies all of the commands with addresses that select that pattern space, copies the pattern space to the standard output, appending a newline, and deletes … Read more
Hit the Esc key to enter “Normal mode”. Then you can type : to enter “Command-line mode”. A colon (:) will appear at the bottom of the screen and you can type in one of the following commands. To execute a command, press the Enter key. :q to quit (short for :quit) :q! to quit … Read more
If you don’t have permission to the file (e.g. you don’t own the file), then it will not force the write. If you do have permission to the file, but it is a read-only file, then you can force-write it. It’s as if you first change the file mode to writable, write your changes, and … Read more