Error handling in Bash

To check if a command was successfully run in our bash script, we have to check the value of its output, which is stored in the $? variable. If its value equals to 0, then the command was successful, otherwise, an error was thrown:

rm ~/data.tar.bz2
if [ "$?" != 0 ]; then
   echo "ERROR: Could not delete file"
   exit 1
fi

$ _