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Lets say I have a file called large. In the file is just a bunch of cal commands copied for about 100 lines. Is there a way to run something at the end of this file that will show the total number of inputs?

I know that I can display the inputs from the file using wc -l large.sh but I'm curious if there is a way to do it inside of the file itself.

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$0 contains the path to the script itself. You can try running

wc -l < "$0"

If there's a cd command somewhere in the script, you'll need to capture the absolute path to the script first.

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