🐛 Fix sed and grep errors and x-plat problems

[dmihalcik-virtru]

• sed -I is not in the posix standard, and has different properties, so either don't use it or work around it
• there was an error in the grep logic so I made it more straightforward and used the long versions of the arguments for clarity. IDK if they are all standard but the arguments were in the man pages on both macOS and ubuntu (latest)

[sonarqubecloud]

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