"shell check variable is set"

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1. shell if variable is set ••• /mo •••
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3. shell check if variable is set and not empty ••• /mo •••
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10. how to set variable in shell ••• /mo •••
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12. bash check if a variable is set ••• /mo •••
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15. shell check variable exists ••• /mo •••
16. shell check if variable is empty ••• /mo •••
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18. what is shell variable in linux ••• /mo •••
19. python check shell variable ••• /mo •••
20. defining variable in shell script ••• /mo •••

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