CODEWITHSUNDEEP
linuxbashsed
halexh
halexh

Reputation: 3121

Append to start and end of first few lines

What sed command would allow me to append one string to the end of every line, a different string to the start of the first line, and a different string to the end of the fifth line?

So far I have

    sed 's/$/<br>/' $FILE1 >> $FILE1_GETS_APPENDED_TO_THIS_FILE

to append a html break statement to the end of each line in the file1. I need to add a header statement around the first 5 lines though. Therefore, the start of the first line needs to have <h3> appended to it and the end of the fifth line needs </h3> appened to it.

Thanks!

Upvotes: 2

Views: 902

Answers (4)

porges
porges

Reputation: 30580

I like awk for this kind of stuff:

awk 'NR==1{print "<h3>"};{print $0, "<br>"};NR==5{print "</h3>"}' file.htm

Upvotes: 1

Didier Trosset
Didier Trosset

Reputation: 37427

It's that easy:

sed 's/$/<br>/; 1 s/^/<h3>/; 5 s/$/<\/h3>/'

As you use $ to match the end of the line, use ^ to match the start of the line.

Then, for each of your commands (such as s), you can specify a line number (or range) where it should apply.

Upvotes: 3

Gilles &#39;SO- stop being evil&#39;
Gilles &#39;SO- stop being evil&#39;

Reputation: 107739

Add a number before a sed command to apply it only to that line. Add two numbers separated by a comma to specify a line number range. $ stands for the last line. For more information, see “addresses” in your sed manual.

sed -e '1 s/^/<h3>/' -e '5 s/$/<\/h3>/' -e '6,$ s/$/<br>/'

Upvotes: 2

choroba
choroba

Reputation: 241758

Have a look at "addresses" in sed manual. You can specify a line number to which a command should be applied:

sed '5s/$/Appended after fifth line/'

Upvotes: 0

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