Linux in a Nutshell, Fifth Edition

i | 763

sed

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

Example

This script collects all lines containing the word Item: and moves

them after a place marker later in the file. The original

Item: lines

are deleted.

/Item:/{

H

d

}

/Summary of items:/G

h

[address1[,address2]]h

Copy the pattern space into the hold space, a special temporary

buffer. The previous contents of the hold space are obliterated. You

can use h to save a line before editing it.

Example

# Edit a line; print the change; replay the original

/Linux/{

h

s/.* Linux \(.*\) .*/\1:/

p

x

}

Sample input:

This describes the Linux ls command.

This describes the Linux cp command.

Sample output:

ls:

This describes the Linux ls command.

cp:

This describes the Linux cp command.

H

[address1[,address2]]H

Append a newline and then the contents of the pattern space to the

contents of the hold space. Even if the hold space is empty, H still

appends a newline. H is like an incremental copy. See Examples

under g and G.

i

[address]i\

text

[address1[,address2]]i \ {G}

text

Insert text before each line matched by address. (See a for details on

text.)

The GNU version accepts two addresses and allows you to put the

first line of text on the same line as the i command.