CODEWITHSUNDEEP
bashawk
user2380782
user2380782

Reputation: 1446

add a column from a specific line using awk

EDIT:

I would like to add a column to a file but only from a specific line onwards. The column to be added is stored in another file, which has several columns and I only want to add the 3rd. The first file has two extra-lines (1st and 2nd line) compared to the second file. I would also like to add an extra string in the second line (at the end of this line)

Here is an example that shows what I want:

$ cat file1.txt
file1
index place value
1 A 0.1
2 A 0.3
3 B 0.1
4 B 0.6

$ cat file2.txt
A 1 0.3
A 1 0.4
B 1 0.4
B 1 0.6

And this it would be the desired output

$ cat output.txt
file1
index place value score
1 A 0.1 0.3
2 A 0.3 0.4
3 B 0.1 0.4
4 B 0.6 0.6

Thanks in advance

Upvotes: 2

Views: 851

Answers (2)

anubhava
anubhava

Reputation: 786359

You can use tail paste and echo:

awk 'NR==1; NR==2{print $0, "score"} NR>2{a[++i]=$0} NR>FNR{print a[FNR], $NF}' file1 file2
file1
index place value score
1 A 0.1 0.3
2 A 0.3 0.4
3 B 0.1 0.4
4 B 0.6 0.6

PS: To get formatted tabular output use column -t:

awk 'NR==1;NR==2{print $0, "score"} NR>2{a[++i]=$0} NR>FNR{print a[FNR], $NF}' file1 file2|
     column -t
file1
index  place  value  score
1      A      0.1    0.3
2      A      0.3    0.4
3      B      0.1    0.4
4      B      0.6    0.6

Upvotes: 1

Ed Morton
Ed Morton

Reputation: 204731

$ paste -d' ' file1.txt <(sed '1s/^/\nscore\n/' file2.txt)
file1
index place value score
1 A 0.1 0.3
2 A 0.3 0.4
3 B 0.1 0.4
4 B 0.6 0.6

Upvotes: 1

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