Sed - stream editor

                                        Sed-Stream Editor

A Stream is data that travels from:

• One process to another through a pipe.
• one file to another as a redirect.
• one device to another.

What Sed do:

Sed Performs text transformations on streams.

Examples:

• Substitute some text for other text.
• Remove lines.
• Append text after given lines.
• Insert text before certain lines.

Note: Sed is used programmatically, Not interactively.

Let's get hands dirty:

#!/bin/bash

echo "John is the assistant regional manager." > manager.txt

1. To exit the text @ only terminal level,but not on the actual file.

• sed 's/assistant/assistant to the' manager.txt

                here s - substution.

      2. Sed is case sensitive by default.

          echo 'my name is naveen' > name.txt

sed '/s/NAVEEN/praveen/' name.txt

output:

my name is naveen ( No change)

To solve above problem use:

sed 's/naveen/praveen/i' name.txt          # here i for eliminating case sensitive in sed statement.

or 

sed 's/naveen/praveen/I' name.txt

    3. To change the global entries in the file using sed.

              sed 's/my wife/my life/g' love.txt

     4.To delete the line with specific key word 

              sed '/This/d' love.txt

here the line starting with This will be deleted automaticallay. and result will obtained in the actual file.

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