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Top Forums Shell Programming and Scripting Reading two lines in a while loop and combining the lines Post 302626555 by valente on Thursday 19th of April 2012 12:08:44 PM
Old 04-19-2012
Reading two lines in a while loop and combining the lines

Dear all,
I have a file like this:
imput
Code:
scaffold_0 1
scaffold_0 10000
scaffold_0 20000
scaffold_0 25000
scaffold_1 1
scaffold_1 10000
scaffold_1 20000
scaffold_1 23283

and I want the output like this:
Code:
scaffold_0 1         scaffold_0 10000
scaffold_0 10000 scaffold_0 20000
scaffold_0 20000 scaffold_0 25000
scaffold_0 25000 scaffold_1 1
scaffold_1 1         scaffold_1 10000
scaffold_1 10000 scaffold_1 20000
scaffold_1 20000 scaffold_1 23283

NOTE: I want the columns separated by tab

In other words, I want to combine
line 1 with line 2
line 2 with line3
line 3 with line4
....

I have this script:
Code:
while read line1
do
    read line2
    echo $line1 $line2
done < imput

But the results is:
Code:
scaffold_0 1         scaffold_0 10000
scaffold_0 20000 scaffold_0 25000
scaffold_1 1         scaffold_1 10000
scaffold_1 20000 scaffold_1 23283

so the script read line 1 and line 2, combine them, but do not follow reading the line 2 and combining with line 3. The script like jump the line 2 and follow the combination of line 3 and line 4 and again jump the next line (line 4).
How can I fix this script?

Best regards.
Moderator's Comments:
Mod Comment How to use code tags

Last edited by Scrutinizer; 04-19-2012 at 01:16 PM..
 

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