Python不等于运算符(Pythonnot equal operators) Operator Description ! = 不是Equal运算符,可在Python2和Python3中使用。 <> 在Python2中不等于运算符,在Python3中已弃用。 我们来看一些Python2.7中不等于运算符的示例。 如果您使用的是Python3.6或更高版本,我们也可以将P
使用双中括号 [[:[[ "string1" operator "string2" ]],这种方法提供了更多的功能和灵活性。 3. 给出bash中字符串对比的具体示例 示例1:检查两个字符串是否相等 bash string1="hello" string2="hello" if [ "$string1" = "$string2" ]; then echo "The strings are equal." else echo "The strin...
[student@studentvm1 testdir]$ X=1 ; if [ $X -eq 1 ] ; then echo "X equals 1" ; else echo "X does not equal 1" ; fi X equals 1 [student@studentvm1 testdir]$ X=0 ; if [ $X -eq 1 ] ; then echo "X equals 1" ; else echo "X does not equal 1" ; fi X does n...
输出 某个变量为空时,会报错:-bash: [: ==: unary operator expected 解决办法 []改为 [[ ]] if [[ $2 == '' ]]; then 但是 这种方式 有时会出现无法判读的错误 , if [ $2 -eq '' ]; then 才是合适的解决方式 === 1 2 3 4 if[ $1 != -v ]; then echo"usage: $0 [-v]" e...
-eq:equal,是否相等。 [root@c7-server ~]# age=28[root@c7-server ~]# [ $age -eq28] [root@c7-server ~]#echo$?0 -ne:not equal,是否不相等。 [root@c7-server ~]# [ $age -ne28] [root@c7-server ~]#echo$?1 -gt:greater than,是否大于。
bash脚本指定python版本,Shell脚本是Linux中过程自动化的重要组成部分。脚本可以帮助您在文件中编写一系列命令,然后执行它们。这节省了您的时间,因为您不必一遍又一遍地编写某些命令。您可以高效地执行日常任务,甚至可以安排它们自动执行。您还可以设置某些脚本在启动时
Logical Operator Meaning Usage =~ Matches Regular Expression [[ $consonants =~ [aeiou] ]] = String Equal To [[ $password = "pegasus" ]] != String Not Equal To [[ $fruit != "banana" ]] ! Not [[ ! "apple" =~ ^b ]] If和Else 条件表达式的功能非常强大,因为我们可以使用它们来控制...
When the `=~'operator is used, the string to the right of the operatoris matched as a regular expression. The&& and || operatorsdonot evaluate EXPR2ifEXPR1 is sufficient to determine the expression's value.Exit Status:0or1depending on value of EXPRESSION. ...
For string comparison the not equal operator != can be used in a conditional expression, for example, string1 != string2. Below is an example of a negative condition on a grep command. if ! grep -q lookupWord "$myFile"; then echo 'Failed to grep'; fi How to use the BASH_REMAT...
else echo "The first number is not greater than or equal to the second." fi Steps: Define two numbers: The script initializes two variables, num1 and num2, with values 20 and 15, respectively. Compare the numbers: The if statement uses the -ge operator to check if the value of num...