[SOLVED] Concatenation of lines

Issue

I need to join every other line in a file with the line after it.

1, 2
3, 4
5, 6
7, 8
9, 10
11, 12

The output should be like:

1, 2, 3, 4
5, 6, 7, 8
9, 10, 11, 12

I have used awk '{getline b;printf("%s,%s\n",$0,b)}' file. However, the output is:

1, 2
,3, 4
5, 6
,7, 8
9, 10
,11, 12

I wonder how each line can be concatenated with the line after it.

Solution

You can use

sed 'N;s/\n/, /' file

This N appends the next line and s command substitutes the newline with a comma and space.

The output is:

1, 2, 3, 4
5, 6, 7, 8
9, 10, 11, 12

Answered By - bkmoney

Answer Checked By - Senaida (WPSolving Volunteer)