Checks if String contains a search String, handling null. This method uses String.indexOf(String). A null String will return false. StringUtils.contains(null, *) = false StringUtils.contains(*, null) = false StringUtils.contains("", "") = true StringUtils.contains("abc", "") = true Str...
str="Hello World" if [[ "$str" == *"Hello"* ]]; then echo "String contains 'Hello'" else echo "String does not contain 'Hello'" fi 这些方法可以帮助你在Bash中正确比较变量和字符串。请注意,变量在比较时需要使用双引号括起来,以避免由于特殊字符引起的错误。
Bash是一种常用的Unix shell和脚本语言,用于在Linux和其他类Unix系统上进行命令行操作和脚本编写。在Bash中,if条件语句用于根据条件的真假执行不同的代码块。 当使用if条件在比...
echo"String /"string1/"is not null."elseecho"String /"string1/"is null"fi #结果显示string1为非空,错误if[ -n"$string1"] #string1仍然未被初始化 then echo"String /"string1/"is not null"elseecho"String /"string1/"is null"fi #结果显示string1为空,结果正确if[ $string1 ] #string1...
if [[ "$1" =~ "$2" ]]; then echo \"$1\" contains \"$2\" else echo \"$1\" does not contain \"$2\" fi } check_substr "$1" "$2" 这个脚本判断传入的第二个参数是否为第一个参数的子字符串。 具体执行结果如下: $ ./check_substr.sh "This is a test string" "test string...
string2="Hello Bash!" if [[ $string1 == "Hello World!" ]] then printf "Same! \n" else print "Different! \n" fi if [[ $string2 = *"Bash"* ]] then printf "Contains word 'Bash'. \n" else printf "Does not contain the word. \n" ...
string1="Hello World!" string2="Hello Bash!" if [[ $string1 == "Hello World!" ]] then printf "Same! \n" else print "Different! \n" fi if [[ $string2 = *"Bash"* ]] then printf "Contains word 'Bash'. \n" else printf "Does not contain the word. \n" ...
var="$(cut -d' ' -f 4 <<< $u)" echo"${var}" 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 想了解更多请阅读 bash 的 man 页: 复制 manbash mancut 1. 2. 另请参见:Bash String Comparison: Find Out IF a Variable Contains a Substring...
-n is one of the supported bash string comparison operators used for checking null strings in a bash script. When -n operator is used, it returns true for every case, but that’s if the string contains characters. On the other hand, if the string is empty, it won’t return true. ...
How to check if a string is in an array? How to use the Bash ternary operator? How to negate an if condition in a Bash if statement? (if not command or if not equal) How to use the BASH_REMATCH variable with the Regular Expression Operator =~?