Thepatternwillmatchif itmatchesanypartofthe string. Anchor thepatternusingthe ‘^’and‘$’ regular expression operatorstoforce ittomatchthe entire string. Thearrayvariable BASH_REMATCH records which partsofthe string matched the pattern. The elementofBASH_REMATCHwithindex0containstheportionofthe string...
tered, an attemptismadetodefine afunctionusing``-f foo=bar'', an attempt is made to assign avaluetoareadonlyvariable, an attemptismadetoassign a valuetoan array variable withoutusingthe compound assignment syntax (see Arrays above), oneofthe namesisnota valid shell variable name, an attempti...
/bin/bash # 方法一:直接赋值 array1=("value1" "value2" "value3") # 方法二:使用索引赋值 array2[0]="value1" array2[1]="value2" array2[2]="value3" # 方法三:从字符串分割赋值 string="value4 value5 value6" array3=($string) # 方法四:使用read命令赋值 echo "Enter values separated...
登录后复制${variable:offset:length}# 其中:# - variable是包含字符串的变量名称# - offset用于指定从何处开始提取字符串的位置,也可以是负的,反向提取# - length用于指定从偏移量开始执行的字符范围# 分配长度是可选的。如果未提供length,则子字符串的结尾将是字符串的结尾 例子如下: 登录后复制# The script ...
we’ve created an array namedfruitswith three elements: ‘apple’, ‘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...
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 $PATH /application/mysql/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr...
IFS=Internal Field Separatoris used to specify a delimiter (which is whitespace in my case). array+=("$line")the line variable stores the value of each line in the file and using this argument, it gets stored in an array. done < "$file"instructs the loop to read the filename from...
Bash 支持for和while循环。 以下是for循环的基本语法: forvariable in listdocommand1 command2 ...done 例如,以下脚本将打印 1 到 5: fori in{1..5}doecho$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: ...
To delete an associative array, use theunsetcommand and provide the array name: unset example_array The command removes the array variable and all the elements. Conclusion After reading this guide, you learned about associative arrays in Bash and how to use them. The feature appears in Bash ve...
name=jerry,name:2结果为rryname:2结果为rry{variable:pos:num}: 偏移pos个字符,取num个字符长度的子串 name=‘hello world’, ${name:2:5}结果为“llo w” 字符串处理,将来在bash中经常用的 bash能力分为三个最为重要: 字符串能力 grep,awk,sed ...