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  1. #!/bin/bash
  2.  
  3. echo "
  4. PATTERN 1
  5. PATTERN 2
  6. NNN
  7. PATTERN 2
  8. PATTERN 1
  9. PATTERN 2
  10. blabla
  11. PATTERN 1
  12. blabla
  13. PATTERN 2
  14. PATTERN 1
  15. PATTERN 2
  16. PATTERN 2
  17. PATTERN 2
  18. abc
  19. bcd" | awk '{if (/PATTERN 2/ && last~/PATTERN 1/){last=$0;next}last=$0}1'
Success #stdin #stdout 0.01s 5432KB
comments (?)
stdin 
Standard input is empty
stdout 
PATTERN 1
NNN
PATTERN 2
PATTERN 1
blabla
PATTERN 1
blabla
PATTERN 2
PATTERN 1
PATTERN 2
PATTERN 2
abc
bcd
https://ideone.com/sMnNC2
language:
Bash (bash 5.0.3)
created:
4 years ago
visibility:
secret

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