# [Bash] + sed, <s>41</s> <s>40</s> 38 bytes

<!-- language: lang-bash -->

    echo $[n=10/1]
    sed -i s/$n/$[n-1]/g $0

[Try it online!]

[Bash]: https://www.gnu.org/software/bash/
[Try it online!]: https://tio.run/nexus/bash#TYxBC4IwHEfP7lP8IMkKdK5r5s0gCAzqFhHTLd3B/8BpBtVnN7t1evB4vFJ2SFHanjplB0KSIMjyXTDqsrbwL7QVMRdX5rRCaOC4T3yyobjyCn48Ti1jd9viBkN4iTiK4s8GyjKvkK7@O6/TucCbed5vFTg@IVodddsY54wlKE1GK84DzNDqxj60gyScsoOh/olBtmSowuK8z1H01ZJ5ypIevw "Bash – TIO Nexus"