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  1. #!/bin/bash
  2. s='user,gender,age,native_lang,other_lang
  3. 0,M,19,finnish,english swedish german 
  4. 1,M,30,urdu,english 
  5. 2,F,26,finnish,english swedish german
  6. 3,M,20,finnish,english french swedish 
  7. 4,F,20,finnish,english swedish '
  8. sed 's/^\(\([^,]*,\)\{3\}\)\([^,]*\)/\1\U\3/' <<< "$s"
Success #stdin #stdout 0.01s 5540KB
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stdin
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Standard input is empty
stdout
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user,gender,age,NATIVE_LANG,other_lang
0,M,19,FINNISH,english swedish german 
1,M,30,URDU,english 
2,F,26,FINNISH,english swedish german
3,M,20,FINNISH,english french swedish 
4,F,20,FINNISH,english swedish
https://ideone.com/dGppHs
language:
Bash (bash 5.0.3)
created:
3 years ago
visibility:
secret

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