"bash test if variable unset"

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1. bash check if variable unset or empty ••• /mo •••
2. bash test if variable not set ••• /mo •••
3. bash test for unset variable ••• /mo •••
4. bash test if variable is unset or empty ••• /mo •••
5. bash check if variable undefined ••• /mo •••
6. bash check if var not set ••• /mo •••
7. bash check for unset variable ••• /mo •••
8. bash check if variable is undefined or empty ••• /mo •••
9. bash check if env var not set ••• /mo •••
10. test for unset variable in bash ••• /mo •••
11. bash unset a variable ••• /mo •••
12. bash test if variable is set ••• /mo •••
13. bash test if variable is empty ••• /mo •••
14. bash test empty variable ••• /mo •••
15. bash fail if variable not set ••• /mo •••
16. bash test if variable defined or not ••• /mo •••
17. bash check if variable set ••• /mo •••
18. bash unset environment variable ••• /mo •••
19. bash set variable if not set ••• /mo •••
20. bash test variable value ••• /mo •••

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