Thepatternwillmatchif itmatchesanypartofthe string. Anchor thepatternusingthe ‘^’and‘$’ regular expression operatorstoforce ittomatchthe entire string. Thearrayvariable BASH_REMATCH records which partsofthe string matched the pattern. The elementofBASH_REMATCHwithindex0containstheportionofthe string...
“=” may be used instead of “==”forstrict POSIX compliance则为真。29[ STRING1 !=STRING2 ] 如果字符串不相等则为真。30[ STRING1 < STRING2 ] 如果 “STRING1” sorts before “STRING2” lexicographicallyinthe current locale则为真。31[ STRING1 > STRING2 ] 如果 “STRING1” sorts after ...
在 Python 中，我们可以使用反转和比较列表、使用 zip（） 函数、将列表转换为字符串等方法检查两个列表...
The pattern will match if it matches any part of the string. Anchor the pattern using the ‘^’ and ‘$’ 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...
numberTwelve variable is equal to 12 你所看到的是if语句的第一行,它在检查变量的值是否真的等于12。如果是的话,语句就会停止,并发出numberTwelve is equal to 12的回显,然后在fi之后继续执行你的脚本。如果变量大于12的话,就会执行elif语句,并在fi之后继续执行。当你使用if或if/elif语句时,它是自上而下工作...
[zexcon@fedora ~]$ ./learnToScript.sh numberTwelve variable is equal to 12 你所看到的是if语句的第一行,它在检查变量的值是否真的等于12。如果是的话,语句就会停止,并发出numberTwelve is equal to 12的回显,然后在fi之后继续执行你的脚本。如果变量大于12的话,就会执行elif语句,并在fi之后继续执行。当...
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 =~?
echo"File descriptor 1 is connected to a terminal" fi 7. test能够判断变量是否为数字类型。 •-eq:等于 •-ne:不等于 •-gt:大于 •-ge:大于等于 •-lt:小于 •-le:小于等于 下面是一些示例用法: #判断变量是否等于某个数字 iftest$var-eq10 then echo"Variable is equal to 10" fi #...
其中PROMPT MESSAGE为提示用户的信息,变量VARIABLE可以保存用户的输入,可以在程序中使用该变量 #!/bin/bash read -p "Please Enter You Name: " NAME echo "Your Name Is: $NAME" 测试 测试主要用于条件判断。[ condition-to-test-for ],如[ -e /etc/passwd ],注意的是[]前后必须有空格,如[-e /etc/...
==: Equal to !=: Not equal to -z: Empty string -n: Non-empty string 3. File and Directory Checks: -e: Exists -f: Regular file -d: Directory -r: Readable -w: Writable -x: Executable Example of using If Statement: Let’s illustrate the usage of if statements with a few examples...