How to find file name of the script with in a bash shell script

With in a bash shell script, you can use the very first command line argument ($0) to find the name of the script.
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Bash shell script to convert string from lower to upper case

The tr command can be used to change the case of a string variable.
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How to get exit code of previous command in Bash

A special variable can be used to get the exit status of last command executed.
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