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In Bash, test and [ are shell builtins.
The double bracket [[, which is a shell keyword, enables additional functionality. For example, you can use && and || instead of -a and -o and there's a regular expression matching operator =~.
Also, in a simple t...
$ time for ((i=0; i<10000000; i++)); do [[ "$i" = 1000 ]]; donereal 0m24.548suser 0m24.337ssys 0m0.036s$ time for ((i=0; i<10000000; i++)); do [ "$i" = 1000 ]; donereal 0m33.478suser 0m33.478ssys 0m0.000sThe braces, in addition to delimiting a variable name are used for parameter expansion so you ...
Content Under CC-BY-SA license How to use double or single brackets, parentheses, curly braces
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WEBMay 9, 2024 · What Are Double Square Brackets “[[ ]]” in Bash? 6 Examples of Using Double Square Brackets “[[ ]]” With “if” Condition in Bash. Example 1: Numeric Comparison Test Using Double Brackets; …
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