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  1. #!/bin/bash
  2. s="dog 50_50_S5_Scale
  3. cat 10_RV_S76_Scale
  4. mouse 15_SQ_S81_Scale"
  5.  
  6. sed 's/\([^S]*\)S.*/& \1/' <<< "$s"
Success #stdin #stdout 0s 4384KB
stdin
Standard input is empty
stdout
dog 50_50_S5_Scale dog 50_50_
cat 10_RV_S76_Scale cat 10_RV_
mouse 15_SQ_S81_Scale mouse 15_