Unix: How can I test if a variable is empty or contains only spaces?

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Unix & Linux: How can I test if a variable is empty or contains only spaces? (8 Solutions!!) Unix & Linux: How can I test if a variable is empty or contains only spaces? (8 Solutions!!)
How can I test if a variable is empty or contains only spaces? How can I test if a variable is empty or contains only spaces?
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Space actually never ends 😖 #shorts Space actually never ends 😖 #shorts