"if variable not set bash"

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1. if variable not empty bash ••• /mo •••
2. if variable is set bash ••• /mo •••
3. if variable not defined bash ••• /mo •••
4. if variable not null bash ••• /mo •••
5. if var not empty bash ••• /mo •••
6. if var is set bash ••• /mo •••
7. if variable is null bash ••• /mo •••
8. if variable is defined bash ••• /mo •••
9. check if variable not set bash ••• /mo •••
10. bash set variable if not set ••• /mo •••
11. bash fail if variable not set ••• /mo •••
12. bash if variable not set ••• /mo •••
13. bash set variable command not found ••• /mo •••
14. bash check if variable is not set ••• /mo •••
15. bash set environment variable if not set ••• /mo •••
16. bash set variable if not already set ••• /mo •••
17. bash if variable is set ••• /mo •••
18. bash check if variable set ••• /mo •••
19. bash set if not set ••• /mo •••
20. bash test if variable is set ••• /mo •••

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