Shell 脚本中 case 语句必须以 esac 关键字结束
WebJul 9, 2024 · Teams. Q&A for work. Connect and share knowledge within a single location that is structured and easy to search. Learn more about Teams WebApr 3, 2024 · No, the basic structure for a case statement is that only one matching segment gets executed. Except for fall-through which you are rejecting. Also, it only works on some shells, not all, and has a syntax specific for each shell. The Bash syntax for fall-through is ;;&.
Shell 脚本中 case 语句必须以 esac 关键字结束
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WebFeb 19, 2024 · shell脚本—case用法 文章目录shell脚本—case用法1.什么是case？2.case使用场景3.case语法 1.什么是case？case语句和if类似，也是用来判断的，只不过当判断的条件较多时，使用case语句会if更加方便 2.case使用场景 在生产环境中，我们总会遇到一个问题需要根据不同的状况来执行不同的预案，那么我们要处理 ... WebApr 8, 2024 · shell脚本中的case条件语句介绍和使用案例. #前言：这篇我们接着写shell的另外一个条件语句case，上篇讲解了if条件语句。. case条件语句我们常用于实现系统服务 …
WebDec 23, 2024 · C语言的case只能匹配整型或字符型常量表达式，而Shell脚本的case可以匹配字符串和Wildcard，每个匹配分支可以有若干条命令，末尾必须以;;结束，执行时找到第一个匹配的分支并执行相应的命令，然后直接跳到esac之后，不需要像C语言一样用break跳出。 WebNov 21, 2024 · シェルスクリプトに挑戦しよう（9）制御構文[その2]――caseによる条件分岐. （1/2 ページ）. 今回は、文字列のパターンで分岐する「case」を解説します。. 複数の条件で“Aなら～する”、“Bなら～する”、“Cなら～する”のように処理を分けたい場合は ...
WebJun 27, 2024 · case 语句匹配一个值或一个模式，如果匹配成功，执行相匹配的命令。. case语句格式如下：. case工作方式如上所示。. 取值后面必须为关键字 in，每一模式必 … WebJun 27, 2024 · case 语句匹配一个值或一个模式，如果匹配成功，执行相匹配的命令。. case语句格式如下：. case工作方式如上所示。. 取值后面必须为关键字 in，每一模式必须以右括号结束。. 取值可以为变量或常数。. 匹配发现取值符合某一模式后，其间所有命令开始执 …
WebSep 4, 2024 · 详解shell脚本case条件语句，开发各种服务启动脚本跳板机. #前言：case条件语句我们常用于实现系统服务启动脚本等场景，case条件语句也相当于if条件语句多分支 …
WebDec 7, 2024 · 注意：case 这个关键字是 bash 的内置命令，该命令要求最后一个参数必须是 esac，esac 关键字自身并不是 bash 的内置命令，它仅仅只是 case 命令要求必须提供的一个参数而已。 下面以一个 testcase.sh 脚本来举例说明 case 命令的详细用法，脚本内容如下： in expression 42 what is 2WebDec 29, 2010 · According to the Bash manual about case in Conditional Constructs. Each pattern undergoes tilde expansion, parameter expansion, command substitution, and arithmetic expansion. Nothing about Brace Expansion unfortunately. So you'd have to do something like this: case $1 in req*) ... ;; met* meet*) ... inexpress wineWeb语法. case...esac 语句基本语法 是为了给一个表达式计算和几种不同的语句来执行基于表达式的值。. 解释器检查每一种情况下对表达式的值，直到找到一个匹配。. 如果没有匹配，默 … logistic regression seabornWebThis makes use of grep to do the pattern matching for you, but still allows you to specify multiple pattern sets to be used in a case-statement structure. For instance: If either aaa , bbb , or ccc is the first argument to the script, this will output matched - pattern1 . inex propertiesWeb) list ;; ] ... esac A case command first expands word, and tries to match it against each pattern in turn, using the same matching rules as for pathname expansion (see Pathname Expansion below). The word is expanded using tilde expansion, parameter and variable expansion, arithmetic substitution, command substitution, process substitution and quote … inexpugnablyNatively available from within the Bash shell, case conditional statements, formulated using the case and esac idioms (an idiom is a word or a group of words, or a keyword, with established usage patterns; a form of expressing a computer language), one can construct a complex conditional case-by-case (hence the term … See more We define our test script test.shas follows: Next, we make our script executable by executing chmod +x test.shand then we execute the script itself, each time passing a different option as input. In our case opening clause, we … See more In this tutorial, we looked at practical examples of Bash based case .. esac statements. We also saw where case statements are a … See more We could also write out the previous code using an ifstatement: This looks comparable in code quality and shortness in comparison with our case .. esac code, and in the given … See more Let us expand on our previous script and make our conditions a bit more complex: In this case, we have listed two possible options for each code block and separated them by a separator. … See more in expression tableauWebFor reference, however this is already mentioned in this answer, from man bash Pattern Matching section provide rules for composite pattern creation as: . Composite patterns may be formed using one or more of the following sub-patterns:?(pattern-list) inex rfid