if[[ $name =~ \.[a-z]{3}$ ]];thenecho $name has three-letter suffix fi a.txt has three-letter suffix 至于正则匹配中的捕获,保存在Bash变量BASH_REMATCH中,更多内容可以参考Bash手册中的Compound Commands部分 数字大小比较 最后我们看下关于数字的条件表达式例子。假如我们希望比较两个数字的大小,不...
查看man bash 对${parameter/pattern/string}的说明如下: Pattern substitution. The pattern is expanded to produce a pattern just as in pathname expansion. Parameter is expanded and the longest match of pattern against its value is replaced with string. If pattern begins with /, all matches of pat...
the rules described below under Pattern Matching. The return value is 0 if the string matches or does not match the pattern, respectively, and 1 otherwise. Any part of the pattern may be quoted to force it to be matched as a string. [root@smsgw root]#STR=12345 [root@smsgw root]#[[...
case$variableinpattern1)# commands to be executed if $variable matches pattern1;; pattern2)# commands to be executed if $variable matches pattern2;; *)# commands to be executed if $variable doesn't match any pattern;;esac 示例: #!/bin/bashday="Monday"case$dayinMonday)echo"Today is Mon...
If we run the previous command, note that it only matches the filenames that must contain at least one “f” which means that the.txtfile won’t be a match. $ls+(f).txt 9. @(patterns) It is used when matching with one occurrence of the specified pattern. ...
accordingly (as in regex(3)). The return value is 0 if the string matches the pattern, and 1 otherwise. If the regular expression is syntactically incorrect, the conditional expression’s return value is 2. If the shell option nocasematch is enabled, the match is performed without regard ...
[["$date"=~^regex$]]&&echo"matched"||echo"did not match" 如果测试成功,则执行&&后面的命令;如果测试失败,则执行||后面的命令。 在其他shell中,可以使用grep。如果你的shell是POSIX兼容的,可以 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
${variable%%pattern} # if the pattern matches the end of the variable's value, delete the longest part that matches and return the rest ${variable/pattern/string} # the longest match to pattern in variable is replaced by string. Only the first match is replaced ...
[ [(] pattern [| pattern]…) command-list ;;]… esac case会根据下面描述的规则选择性地执行与单词匹配的第一个模式对应的命令列表: 如果启用了nocasematch选项(详见 "4.3.2 内置shopt),则在进行匹配时不考虑字母的大小写。|用于分隔多个pattern(模式),而)运算符用于结束一个模式列表。一组pattern和关联的...
=运算符与==是相同的。如果启用了nocasematch选项(详见 “4.3.2 内置shopt”),则在匹配时不考虑字母的大小写。如果字符串匹配==或者不匹配!=模式,则返回值为 0;否则为 1。 如果你使用 shell 的任何引用机制来引用模式(pattern)的任何部分,被引用的部分将被字面地匹配。这意味着被引用部分中的每一个字符都...