Essential Books

Switch statement with case

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With the case statement you can match values against one variable.

The argument passed to case is expanded and try to match against each patterns.

If a match is found, the commands upto ;; are executed. 

case "$BASH_VERSION" in
 [34]*)
    echo {1..4}
    ;;  
  *)
    seq -s" " 1 4
esac

Pattern are not regular expressions but shell pattern matching (aka globs).

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Control structures:
* Control Structures
* Conditional execution of command lists
* If statement
* Looping over an array
* Using For Loop to List Iterate Over Numbers
* Loop break
* For Loop with C-style syntax
* continue and break
* While Loop
* Switch statement with case
* For Loop without a list-of-words parameter
* Until Loop
* For Loop
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