执行case 尝试匹配的 表达式 与子句之一。它通过依次查看每个子句来尝试找到匹配的模式来做到这一点。子句中的模式是字符串，但是——与直觉相反——这并不意味着我们不能使用数值作为表达式。一般情况 case语句的一般形式是这样的：case expression in pattern-1) statement ;; pattern-2)
In a Bashcasestatement, the variable holds a value that is used to compare against defined patterns. When thecasestatement is executed, the script compares the input$variableagainst each pattern in the defined order until it finds a match. Once a match is found, the corresponding command associ...
这存储在Extension字符串变量中。 该case语句使用Extension变量作为它试图与子句匹配的表达式。 #!/bin/bash for File in $(ls) do # extract the file extension Extension=${File##*.} case "$Extension" in sh) echo " Shell script: $File" ;; md) echo " Markdown file: $File" ;; png) echo ...
Case Statement Example Below is an example of using a case statement in a bash script that prints the official language of a given country: languages.sh #!/bin/bash echo -n "Enter the name of a country: " read COUNTRY echo -n "The official language of $COUNTRY is " case $COUNTRY ...
Example of a BASH Script with the CASE Statement #!/bin/bash printf 'Which Linux distribution do you know? ' read DISTR case $DISTR in ubuntu) echo "I know it! It is an operating system based on Debian." ;; centos|rhel) echo "Hey! It is my favorite Server OS!" ...
Running the script a few times shows the different exit codes being correctly identified by the case statement. ./return-code.sh Legibility Helps Maintainability Going back to old Bash scripts and working out how they do what they do, especially if they were written by someone else, is challen...
Conditional tests can be performed in Bash Scripting using the "if" statement, where the statement inside the "if" block is executed only if the specified condition is met. How can I check for a existing file in a bash script? Use the if [ -f "file.txt" ]; then command to check ...
ShellScript bashにおけるcase文の書き方をまとめる 書き方の例 下記に変数に特定の値や文字列が入っているときに特定の処理を行うcase文を記載する。 変数には任意の値が格納されているものとする。 #!/bin/bashcase${変数A}in"文字列B")変数Aに文字列Bが格納されている時に行いたい処理;;"文...
We can use acasestatement to print a different message for each color using theechocommand: $ cat case_script.sh #!/usr/bin/env bash color="green" case $color in red) echo "The color is red." ;; green) echo "The color is green." ;; blue) echo "The color is blue." ;; yell...
在局域网环境中工作,经常要访问别人的电脑,而他们大多还在使用windows,所以要反复的mount、umount共享目录,烦死了,并且不umount还不行,别人一关机,这边再操作就要停顿半天没反应。所以编写了一个小小的shell script,简化这些工作。代码、注释和说明都在一起了,应该不用再多解释了吧。