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  1. #!/bin/bash
  2. s="coffe
  3. milk
  4. water";
  5. checkval="milk";
  6. if [[ $checkval != \#* ]]; then
  7.   sed "s/$checkval/#&/" <<< "$s"
  8. else
  9.   sed "s/$checkval/${checkval:1}/" <<< "$s"
  10. fi;
  11.  
Success #stdin #stdout 0s 4408KB
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coffe
#milk
water
https://ideone.com/sclXDm
language:
Bash (bash 5.0.3)
created:
6 years ago
visibility:
secret

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