How can i print unique value of particular column and then print rest of the columns in next line

Question

I want to do tsv file processing using awk, Here's my input:

scaffold1   1   100 
scaffold1   101 200
scaffold1   201 300
scaffold2   1   100
scaffold2   201 500
scaffold3   10  500
scaffold4   10  300

Desired_output:

Feature scaffold1
1   100
101 200
201 300
Feature scaffold2
1   100
01  500
Feature scaffold3
10  500
Feature scaffold4
10  300

I tried using uniq and sort and also awk for printing uniq of first column using command awk '!seen[$1]++ Input.txt but it prints all unique values from first column and then i can print rest of the columns, but i want to print first unique value and rest columns in the next line, as shown above.

Please tell me is there a way to do this?

Answer 1

Using awk:

awk '!seen[$1]++ {print "Feature",$1} {print $2,$3}' file
Feature scaffold1
1 100
101 200
201 300
Feature scaffold2
1 100
201 500
Feature scaffold3
10 500
Feature scaffold4
10 300

Answer 2

i Have done this by using combination of sed and awk tested and its works fine

code:

---

for o in `awk '{print $1}' example.txt| sort | uniq `; do sed -n "/$o/p" example.txt | sed "s/$o//g" |sed "1i Feature $o"; done  

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output

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Feature  scaffold1
 1   100
  101 200
  201 300
Feature  scaffold2
  1   100
  201 500
Feature  scaffold3
  10  500
Feature  scaffold4
  10  300

---