Adding header to a table in unix

Asked Jul 12 '21 at 20:34

Active Jul 12 '21 at 20:34

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I am trying to add a header to following file.txt file

20481   20481   2       1
20483   20483   1       2
20488   20488   2       2
20492   20492   1       2
20493   20493   1       1
20498   20498   2       1

I have tried using awk 'NR == 1 { $0 = "FID IID SEX LUNG_CANCER" }; 1' file.txt > hdr.txt But it actually replaced the first line which is not correct. Where i am doing wrong.

FID IID SEX LUNG_CANCER
20483   20483   1       2
20488   20488   2       2
20492   20492   1       2
20493   20493   1       1
20498   20498   2       1
20500   20500   2       2

asked Jul 12 '21 at 20:34

Aryh

2

In the `NR == 1` block, just `print` the header, no need to manipulate $0 – glenn jackman Jul 12 '21 at 20:35
Does this answer your question? [Shell one liner to prepend to a file](https://stackoverflow.com/questions/54365/shell-one-liner-to-prepend-to-a-file) – Benjamin W. Jul 12 '21 at 20:58

Adding header to a table in unix

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