Bash -

Template

#!/bin/bash
set -xeuo pipefail

# -x = Shell will log to each command to standard error before it is executed.
# -e = Shell will exit immediately if any of the commands return status >0,
#      except if it's part of while, until, if, AND, OR, !.
# -u = Accessing unset variables exits the shell.
# -o pipefail = Failure of any commands in pipelines exits the shell.

Command-to-variable assignment can cause problems. If you set output of a command to a variable and it returns non-zero status code, -e will cause the script to fail.