String="Test"if[[-n$String]];thenecho"The variable String is not an empty string."fi 输出: The variable String is not an empty string. 在这个程序中,String是一个非空变量。由于-n运算符返回true,如果string的长度不是0,因此我们得到The variable String is not an empty string.作为给定程序的输出...
Bash string comparison syntax Here is how you compare strings in Bash. if [ "$string1" == "$string2" ] You can also use a string directly instead of using a variable. if [ "$string1" == "This is my string" ] Let me show it to you with proper examples. ...
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...
tabs, multiple blanks and all — whereas (2) the unquoted version (echo $VARIABLE) replaces each sequence of one or more blanks, tabs and newlines with a single space.
Bash also allows users to check if a variable is an empty string or not. Check for empty strings using the-nand-zoperators. Follow the steps below to create an example script for each operator: The-zOperator Search for empty strings with the-zoperator by following the steps below: ...
Let’s create a Bash script to take the username as input from the user and compare the name string with the hardcoded name. #!/bin/bash echo "Enter Username" read name while [ "$name" = "sam" ] || [ "$name" = "Sam" ] ...
This will test whether the variable$foois equal to the string*ar. It will work even if$foois empty because the quotation marks will force an empty string comparison. The quotes around*arwill prevent the shell from interpolating the glob. This is a true equality. ...
-z string - True if the string length is zero. -n string - True if the string length is non-zero. Following are a few points to be noted when comparing strings: A blank space must be used between the binary operator and the operands. Always use double quotes around the variable names...
my_variable_name="Hello World" echo $my_variable_name 对于camel case或pascal case命名的变量,可以在Bash中使用,但不是最常见的做法。如果有特定需求,可以按照相应的命名规范来命名变量。 腾讯云相关产品和产品介绍链接地址:腾讯云官网:https://cloud.tencent.com/ 请注意,以上答案仅供参考,具体命名规范和实...
To delete an associative array, use theunsetcommand and provide the array name: unset example_array The command removes the array variable and all the elements. Conclusion After reading this guide, you learned about associative arrays in Bash and how to use them. The feature appears in Bash ve...