fork(1) download 
  1. match($0,/Charging, [0-9]+%/){print substr($0,RSTART+10,RLENGTH-11)}
Success #stdin #stdout 0s 4444KB
comments (?)
stdin 
Battery 0: Charging, 18%, 01:37:09 until charged
stdout 
18
https://ideone.com/nzSGKs
language:
AWK (gawk 4.2.1)
created:
5 years ago
visibility:
public

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