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  1. #!/bin/bash
  2. grep -oP '\broot=\K\S+' <<< "BOOT_IMAGE=/vmlinuz-5.15.0-57-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7"
Success #stdin #stdout 0.01s 5472KB
comments (?)
stdin 
Standard input is empty
stdout 
/dev/mapper/vgubuntu-root
https://ideone.com/VeXmvS
language:
Bash (bash 5.0.3)
created:
2 years ago
visibility:
secret

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