true if the String contains the search character, false if not or null string input 判断是否包含另外的子串 org.apache.commons.lang.StringUtils contains方法 写道 public static boolean contains(String str, String searchStr) Checks if String contains a search String, handling null. This method uses ...
在上述代码中,首先将原始字符串和子串都转换为小写,然后使用${string%%substring}的语法来删除尾随子串。${string%%substring}表示从字符串的末尾开始,删除最长匹配的子串。 运行以上脚本,输出结果为Hello,即删除了尾随子串"world"。 对于Bash脚本的更多详细信息,可以参考腾讯云的产品文档:Bash脚本。
valint() #@ USAGE: valint INTEGER case ${1#-} in ## Leading hyphen removed to accept negative numbers *[!0-9]*) false;; ## the string contains a non-digit character *) true ;; ## the whole number, and nothing but the number esac 如果函数体用括号括起来,那么它是在子 shell ...
[0-9] ) echo "输入了数字 $character" ;; * ) echo "输入不符合要求" esac上面例子中,使用通配符[[:lower:]] | [[:upper:]]匹配字母,[0-9]匹配数字。Bash 4.0之前,case结构只能匹配一个条件,然后就会退出case结构。Bash 4.0之后,允许匹配多个条件,这时可以用;;&终止每个条件块。#...
character string which contains three types of objects: plain characters, which are simply copied to standard output, character escape sequences, which are converted and copied to the standard output, and format specifications, each of which causes printing of the next successive argument. In additio...
Unlike many other programming languages, Bash does not segregate its variables by "type." Essentially,Bash variables arecharacter strings, but, depending on context, Bash permits arithmetic operations and comparisons on variables. The determining factor is whether the value of a variable contains only...
You can assign data to a variable using the equals sign (=). The data you store in a variable can either be a string or a number. Let’s create a variable now on the command line: chapter_number=5 The variable name is on the left hand side of the equals sign, and the data whic...
echo " $@ contains errors, it must contain only letters" } 1. 2. 3. 4. 5. 函数nameerror用于显示所有无效输入错误。使用特殊变量$@显示所有参数,这里为变量FNAME和SNAME值。完成脚本如下: #!/bin/sh # char_name() # char_name # to call: char_name string ...
# return the last character of a string in $rval if [ -z "$1" ]; then # empty string rval="" return fi # wc puts some space behind the output this is why we need sed: numofchar=`echo -n "$1" | wc -c | sed 's/ //g' ` ...
We can also use the tail command with the -c option to specify the last three characters of a string. However, in this case, we need to iterate over each line of the file before we use the tail command: $ cat last_three_characters.sh #!/usr/bin/env bash while read -r line; do...