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  1. #!/bin/bash
  2. s="Line 1
  3. # param = 0
  4. param = 1
  5. # param = 2
  6. text...."
  7.  
  8. sed -E '0,/^ *#? *param *=/s/^ *#? *param *=.*/param = 1/' <<< "$s"
Success #stdin #stdout 0s 19632KB
comments (?)
stdin 
Standard input is empty
stdout 
Line 1
param = 1
param = 1
# param = 2
text....
https://ideone.com/AOAwhU
language:
Bash (bash 5.0.3)
created:
6 years ago
visibility:
secret

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