Thepatternwillmatchif itmatchesanypartofthe string. Anchor thepatternusingthe ‘^’and‘$’ regular expression operatorstoforce ittomatchthe entire string. Thearrayvariable BASH_REMATCH records which partsofthe string matched the pattern. The elementofBASH_REMATCHwithindex0containstheportionofthe string...
nameref attribute)andvalueofany existing variablewiththe same name at a surrounding scope.Ifthereisno existing variable, the local variableisinitially unset. The following options can be usedtorestrict outputtovariableswiththe specified attributeortogive variables attributes: -aEachnameisan indexed arra...
AI代码解释 [xiaoqi@study~]$ echo $variable[xiaoqi@study~]$ echo $PATH/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/xiaoqi/.local/bin:/home/xiaoqi/bin[xiaoqi@study~]$ echo ${PATH}#使用这种方法获取变量比较规范/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/xiaoq...
Variable.sh代码如下: #!/bin/bash fruit=apple count=5 echo "we have $count $fruit(s)" [cairui@cai shell]$ sh variable.sh we have 5 apple(s) Export命令就是用来设置环境变量: [cairui@cai shell]$ echo $PATH /application/mysql/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr...
making them a good choice for basic array looping. ‘While’ and ‘until’ loops offer more control over the loop condition, which can be useful in more complex scenarios. However, they require you to manually manage a counter variable, which can lead to off-by-one errors if you’re not...
When no array variable name is provided to the mapfile command, the input will be stored into the $MAPFILE variable. Note that the mapfile command will split by default on newlines character but will preserve it in the array values, you can remove the trailing delimiter using the -t ...
array()created an empty array calledarray. IFS=Internal Field Separatoris used to specify a delimiter (which is whitespace in my case). array+=("$line")the line variable stores the value of each line in the file and using this argument, it gets stored in an array. ...
2. Print an Array in Bash Using the “declare -p” Command The declare -p command in Bash displays the current state of a variable and, regarding arrays, prints the elements of the array including its name, variable type, and index. Below is a script to print an indexed array in Bash...
cherry" # 使用了双引号, "$variable_split" 仅有一个元素, 即为 apple banana cherry for elem in "$variable_split"; do echo "$elem" done # 没使用双引号, Shell 会进行单词拆分, $variable_split 包含三个元素, 分别是 apple, banana, cherry for elem in $variable_split; do echo "$elem" ...
forvariable in listdocommand1 command2 ...done 例如,以下脚本将打印 1 到 5: fori in{1..5}doecho$idone 以下是while循环的基本语法: while[condition]docommand1 command2 ...done 例如,以下脚本将打印 1 到 5: i=1while[$i-le5]doecho$i((i++))done ...