Sed (stream editor)

Stream EDitor sed: line editor
The default sed: mode space does not edit the original file, only the data in the mode space to do processing; and then, after the end of the processing, the pattern space is printed to the screen

sed [options]'AddressCommand'file file...

-n: silent mode, the default ...

vim editor

1. open the file

# vim /path/to/somefile
      vim + #: Open the file, and positioned at the first # line
      vim +: Open File, navigate to the last row
      vim +/PATTERN: Open File, navigate to the line the first time to the line matching PATTERN

2. close the file

1) line mode close the file
:q ...