课程: Linux: Bash Shell and Scripts

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Control-flow case statements and if-then-else with the test command

Control-flow case statements and if-then-else with the test command - Linux教程

课程: Linux: Bash Shell and Scripts

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Control-flow case statements and if-then-else with the test command

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- [Teacher] The Case Statement is used in a Bash script to compare an expression to a sequence of patterns. The expression might be value of a variable. The patterns are file glob kinda patterns, not regular expressions, and they're checked in sequence. So here, we look at the value of the variable ans, or answer, and we'd first compare it to all-lowercase yes or all-uppercase YES, or just the little y or just the big Y, or y.x. So if ans matches any of those patterns, then we're gonna print out "Will do!" The semicolon semicolon right next to each other with no spaces there is a special Case Statement thing of saying, "This is the end of the statements "we're gonna do for this pattern." Now y.x looks like maybe kind of a special regular expression sorta thing, but in file-globbing, dot means dot, it doesn't mean a special character. So we'd actually have to type in y dot x, not yax or ybx or something like that. y dot x, that's not really special. The second pattern we have, n star…

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