snippetbashTip
case — Bash builtin construct for creating multi-choice conditional statements. More information: <https://
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constructcommandcaseclibuiltincreatingforbash
Problem
How to use the
case command: Bash builtin construct for creating multi-choice conditional statements. More information: <https://www.gnu.org/software/bash/manual/bash.html#index-case>.Solution
case — Bash builtin construct for creating multi-choice conditional statements. More information: <https://www.gnu.org/software/bash/manual/bash.html#index-case>.Match a variable against string literals to decide which command to run:
case {{$COUNTRULE}} in {{words}}) {{wc --words README}} ;; {{lines}}) {{wc --lines README}} ;; esacCombine patterns with |, use * as a fallback pattern:
case {{$COUNTRULE}} in {{[wW]|words}}) {{wc --words README}} ;; {{[lL]|lines}}) {{wc --lines README}} ;; *) {{echo "what?"}} ;; esacAllow matching multiple patterns:
case {{$ANIMAL}} in {{cat}}) {{echo "It's a cat"}} ;;& {{cat|dog}}) {{echo "It's a cat or a dog"}} ;;& *) {{echo "Fallback"}} ;; esacContinue to the next pattern's commands without checking the pattern:
case {{$ANIMAL}} in {{cat}}) {{echo "It's a cat"}} ;& {{dog}}) {{echo "It's either a dog or cat fell through"}} ;& *) {{echo "Fallback"}} ;; esacDisplay help:
help caseCode Snippets
Match a variable against string literals to decide which command to run
case {{$COUNTRULE}} in {{words}}) {{wc --words README}} ;; {{lines}}) {{wc --lines README}} ;; esacCombine patterns with |, use * as a fallback pattern
case {{$COUNTRULE}} in {{[wW]|words}}) {{wc --words README}} ;; {{[lL]|lines}}) {{wc --lines README}} ;; *) {{echo "what?"}} ;; esacAllow matching multiple patterns
case {{$ANIMAL}} in {{cat}}) {{echo "It's a cat"}} ;;& {{cat|dog}}) {{echo "It's a cat or a dog"}} ;;& *) {{echo "Fallback"}} ;; esacContinue to the next pattern's commands without checking the pattern
case {{$ANIMAL}} in {{cat}}) {{echo "It's a cat"}} ;& {{dog}}) {{echo "It's either a dog or cat fell through"}} ;& *) {{echo "Fallback"}} ;; esacDisplay help
help caseContext
tldr-pages: common/case
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