"bash script fail if variable not set"

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1. bash script fail if environment variable not set ••• /mo •••
2. bash set variable if unset ••• /mo •••
3. bash set variable if not set ••• /mo •••
4. bash set if not set ••• /mo •••
5. bash if variable is not empty ••• /mo •••
6. bash if variable is set ••• /mo •••
7. if not bash script ••• /mo •••
8. bash test if variable defined or not ••• /mo •••
9. check if variable is not empty bash ••• /mo •••
10. bash test if variable is set ••• /mo •••
11. bash set variable if empty ••• /mo •••
12. bash script if variable is empty ••• /mo •••
13. bash set variable to false ••• /mo •••
14. bash check if variable is set ••• /mo •••

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