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-e option will cause a bash script to exit immediately when a command fails
set -e or set -o errexit
set -eo pipefail https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/
set -euxo pipefail
set -u error when performing parameter expansion
set -x print every command that is executed and every variable that is set to the standard output. Useful to debug scripts.