Bash-Beginners-Guide

Bash Guide for Beginners
p Print text.
r Read a file.
s Search and replace text.
w Write to a file.
Apart from editing commands, you can give options to sed. An overview is in the table below:
Table 5-2. Sed options
Option
-e SCRIPT
-f
Effect
-n Silent mode.
Add the commands in SCRIPT to the set of commands to be run while processing the
input.
Add the commands contained in the file SCRIPT-FILE to the set of commands to be
run while processing the input.
-V Print version information and exit.
The sed info pages contain more information; we only list the most frequently used commands and options
here.
5.2. Interactive editing
5.2.1. Printing lines containing a pattern
This is something you can do with grep, of course, but you can't do a "find and replace" using that command.
This is just to get you started.
This is our example text file:
sandy ~> cat -n example
1 This is the first line of an example text.
2 It is a text with erors.
3 Lots of erors.
4 So much erors, all these erors are making me sick.
5 This is a line not containing any errors.
6 This is the last line.
sandy ~>
We want sed to find all the lines containing our search pattern, in this case "erors". We use the p to obtain the
result:
sandy ~> sed '/erors/p' example
This is the first line of an example text.
It is a text with erors.
It is a text with erors.
Lots of erors.
Lots of erors.
So much erors, all these erors are making me sick.
So much erors, all these erors are making me sick.
This is a line not containing any errors.
This is the last line.
Chapter 5. The GNU sed stream editor 63