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24 lines
966 B
Markdown
24 lines
966 B
Markdown
# case
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> Bash builtin construct for creating multi-choice conditional statements.
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> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-case>.
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- Match a variable against string literals to decide which command to run:
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`case {{$COUNTRULE}} in {{words}}) {{wc --words README}} ;; {{lines}}) {{wc --lines README}} ;; esac`
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- Combine patterns with |, use * as a fallback pattern:
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`case {{$COUNTRULE}} in {{[wW]|words}}) {{wc --words README}} ;; {{[lL]|lines}}) {{wc --lines README}} ;; *) {{echo "what?"}} ;; esac`
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- Allow matching multiple patterns:
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`case {{$ANIMAL}} in {{cat}}) {{echo "It's a cat"}} ;;& {{cat|dog}}) {{echo "It's a cat or a dog"}} ;;& *) {{echo "Fallback"}} ;; esac`
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- Continue to the next pattern's commands without checking the pattern:
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`case {{$ANIMAL}} in {{cat}}) echo {{"It's a cat"}} ;& {{dog}}) {{echo "It's either a dog or cat fell through"}} ;& *) {{echo "Fallback"}} ;; esac`
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- Display help:
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`help case`
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