How to tell if a string is not defined in a bash shell script? - Stack Overflow

How to tell if a string is not defined in a bash shell script? - Stack Overflow

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日期:2024-08-22
For those whose want to look for the description of what the above means in the bash man page, look for the section "Parameter Expansion" and then for this text: "When not performing substring expansion, using the forms documented below, bash tests for a ...看更多