following bash script best practices #15
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https://sipb.mit.edu/doc/safe-shell/ `set -e`: exit the whole script if a line fails instead of proceeding to the next line `set -u`: variables that aren't set but are used fail the script `shopt -s failglob`: fail if globs don't get expanded
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https://sipb.mit.edu/doc/safe-shell/
set -e: exit the whole script if a line fails instead of proceeding to the next lineset -u: variables that aren't set but are used fail the scriptshopt -s failglob: fail if globs don't get expanded