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  1. #!/bin/bash
  2. s='IID,kgp11004425,rs11274005,kgp183005,rs746410036,kgp7979600
  3. 1,00,AG,GT,AK,00
  4. 32,AG,GG,AA,00,AT
  5. 100,TT,AA,00,AG,AA       
  6. 3,GG,AG,00,GT,GG'
  7.  
  8. sed -E '1!{:a;s~^([^,]*,.*)00~\1N/A~;ta;}' <<< "$s"
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin 
Standard input is empty
stdout 
IID,kgp11004425,rs11274005,kgp183005,rs746410036,kgp7979600
1,N/A,AG,GT,AK,N/A
32,AG,GG,AA,N/A,AT
100,TT,AA,N/A,AG,AA       
3,GG,AG,N/A,GT,GG
https://ideone.com/rR82Jy
language:
Bash (bash 5.0.3)
created:
4 years ago
visibility:
secret

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