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# Set -e and set -x in shell script
## **set -e**:
Enable checking of all commands. The execution of shell script will be aborted if one command returns non-zero status code.
Examples:
```
# true; echo $?
0
# false; echo $?
1
```
## **set -x**:
Trace the execution of all commands, it makes the interpreter print each commands in terminal before it is executed. Useful for debugging your shell script.
# DEBIAN_FRONTEND="noninteractive"
Turn off debian frontend so no prompt during installation
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