bash 4后,允许使用字符串作为下标,且数组必须先声明。 $ declare -A array $forsubscriptina b c d e>do> array[$subscript]="$subscrupt $RANDOM">done$ printf":%s:\n""${array["c"]}"## 打印单个元素 :25475: $ printf":%s:\n""${array[@]}"## 打印整个数组 :26862: :32278: :25475: ...
Thepatternwillmatchif itmatchesanypartofthe string. Anchor thepatternusingthe ‘^’and‘$’ regular expression operatorstoforce ittomatchthe entire string. Thearrayvariable BASH_REMATCH records which partsofthe string matched the pattern. The elementofBASH_REMATCHwithindex0containstheportionofthe string...
The pattern will match if it matches any part of the string. Anchor the pattern using the ‘^’ and ‘$’ regular expression operators to force it to match the entire string. The array variable BASH_REMATCH records which parts of the string matched the pattern. The element of BASH_REMATC...
‘banana’, and ‘cherry’. The ‘for’ loop then iterates over each element in the array. For each iteration, the current element’s value is stored in thefruitvariable, which we then use in theechocommand to print out a sentence. ...
declare命令可以声明一些特殊类型的变量 declare OPTION VARIABLE=value • -a:声明数组变量。 • -i:声明整数变量。 • -l:声明变量为小写字母。 • -r:声明只读变量。 • -u:声明变量为大写字母。 作用域:Scope 默认都是全局变量 aa=“bb” 局部变量在function里面需要加local 局部变量:local a=99...
The "echo" command prints the value of the variable 'currentDateTime', which contains the current date and time. 9. Array Declaration: Write a Bash script that declares an array named "colors" containing the names of your favorite colors. Print the entire array. ...
# Creating an associative arraydeclare-A myAssociativeArray myAssociativeArray["fruit"]="Apple"myAssociativeArray["vegetable"]="Carrot"# Accessing elementsecho${myAssociativeArray["fruit"]}# Output:# 'Apple' Bash Copy In this example, we created an associative arraymyAssociativeArrayand added two ...
# 位置参数调用, 假设在终端输入 bash bash_tutorial.sh 1 2 3 echo "current script name: \$0 $0" # 当前脚本名称 echo "incoming parameters: \$1 $1 \$2 $2 \$3 $3" # 访问传入的参数 echo "the number of parameters: \$# $#" # 传入的参数数量 echo "all parameters: \$@ $@" # ...
Bash Associative Array (dictionaries, hash table, or key/value pair) You cannot create an associative array on the fly in Bash. You can only use the declare built-in command with the uppercase “-A” option. The += operator allows you to append one or multiple key/value to an associati...
declare -A tmp_array for i in "$@"; do [[ $i ]] && IFS=" " tmp_array["${i:- }"]=1 done printf '%s\n' "${!tmp_array[@]}" } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 用法示例: $ remove_array_dups 1 1 2 2 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 5 ...