Example 3: If statement in bash on less than a number In addition to-eqfor equality you can also try-lt -le -gt -getest conditions for less than, less than or equal, greater than or greater then or equal respectively. Below is a similar example with less then operator-lt: ...
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'Else if'in bash scripting, often written as'elif', is used to check multiple conditions in your code. It is used with the syntax,if [firstStatement]; then... elif [secondCondition]; then... else. It’s a powerful tool that allows your scripts to make decisions based on various scen...
For this, we need to utilize the not operator “!” with the “if” statement in the bash script. Let’s discuss the use of the “if-not” operator in Bash programming with the help of some examples. Get started with the new Bash file creation while using the terminal shell of the ...
if..elif..else..fi if..then..else..if..then..fi..fi..(Nested Conditionals) 语法: if [[ condition ]] then statement elif [[ condition ]]; then statement else do this by default fi 1. 2. 3. 4. 5. 6. 7. 8. 为了创建有意义的比较,我们也可以使用AND -a和OR -o。
There must be space before and after the conditional operator (=, ==, <= etc). Otherwise, you'll see an error like "unary operator expected". Now, let's create an example scriptroot.sh.This script will echo the statement “you are root” only if you run the script as the root use...
-ne 不等于,如:if [ "a"−ne"b" ] -gt 大于,如:if [ "a"−gt"b" ] -ge 大于等于,如:if [ "a"−ge"b" ] -lt 小于,如:if [ "a"−lt"b" ] -le 小于等于,如:if [ "a"−le"b" ] < 小于(需要双括号),如:(("a"<"b")) ...
The-zoperator returnstrueif a string variable is null or empty. How the use the-zBash Operator Afterdeclaring a string variable, use the-zoperator in anif statementto check whether a string is empty or not: MY_STRING="" if [ -z $MYSTRING ] ...
How to find if a number is odd or even in bash? You can use a bash for loop with a nested bash if statement using a bash arithmetic expansion with the module operator. for x in {1..5}; do if (( x % 2 )); then echo "\$x=$x is an odd number" else echo "\$x=$x is...
Used to execute the script in the terminal. ./file.sh Used to execute the script if it is executable. # Used to make comments in the script. && logical AND operator. | | logical OR operator. $# Used to expands the number of arguments passed to the script. $0 Used to expands to th...