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I'm writing a config bash script to build some environment on my Ubuntu.

One thing that needs to be done in this bash script is to append a function into ~/.bashrc so that it could be executed automatically while logging.

However, for some reason, this script might be executed several times. As a result, the same function is appended into ~/.bashrc many times.

Is there a way to solve the problem?

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Instead of blindingly appending, check if it's there or not already.

something like grep -q theFunction .bashrc || echo " theFunction() { .... } " >> .bashrc

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