9- Using sed command, we're able to quickly and easily find and replace a set of characters within afile. sed command uses extended regular expression to define the pattern that should be replaced.sed -i 's/original/new/g' file.txtExplanation:sed = Stream EDitor-i = in-place (i.e. save back to the original file)• The command string:s = the substitute command• original = a regular expression describing the word to replace (or just the word itself)new = the text to replace it with3Dg = global (i.e. replace all and not just the first occurrence)file.txt = the file nameIf we have a file named hello.txt, write a sequence of sed commands that replacesthe followingall occurrence of the word bad with the word good.b) all integer numbers by the word Zerohello.txtThe description of the items512 are good90 are bad44 are excellent12367309

a) sed -i 's/bad/good/gI' hello.txt s= substitute command bad= a regular expression describing the…

Answered: 9- Using sed command, we're able to…

9- Using sed command, we're able to quickly and easily find and replace a set of characters within a file. sed command uses extended regular expression to define the pattern that should be replaced.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

9- Using sed command, we're able to quickly and easily find and replace a set of characters within a
file. sed command uses extended regular expression to define the pattern that should be replaced.
sed -i 's/original/new/g' file.txt
Explanation:
sed = Stream EDitor
-i = in-place (i.e. save back to the original file)
• The command string:
s = the substitute command
• original = a regular expression describing the word to replace (or just the word itself)
new = the text to replace it with
3D
g = global (i.e. replace all and not just the first occurrence)
file.txt = the file name
If we have a file named hello.txt, write a sequence of sed commands that replaces
the following
all occurrence of the word bad with the word good.
b) all integer numbers by the word Zero
hello.txt
The description of the items
512 are good
90 are bad
44 are excellent
123
67
309

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