If statement and else statement could be nested in bash. The keyword “fi” indicates the end of the inner if statement and all if statement should end with the keyword “fi”. The “if then elif then else fi” example mentioned in above can be converted to the nested if as shown belo...
本教程将在 bash 脚本中使用 && 和if 语句。 在Bash 中使用 && 和if 语句 如果$age 等于18 且 $name 等于John,则条件返回真。 age=18 name="John" if [[ $age -eq 18 && "$name" == John ]];then printf "success!!\n" fi 输出: success!!
对于字符串等使用test[ ] or [[ ]] 进行判断 (())中变量是可以不使用$来引用的 example:表述数字范围的时候 可以使用if可以是使用case if [ $x -gt 90 -o $x -lt 100 ] case $x in 100) 9[0-9]) if [ "X$name" != "x" ] 这个语句的意思是如果$name为空,那么X=X成立折执行下面的结果...
Use if else statement Now I add an else statement in the previous script. This way when you get a non-zero modulus (as odd numbers are not divided by 2), it will enter the else block. #!/bin/bash read -p "Enter the number: " num mod=$(($num%2)) if [ $mod -eq 0 ]; t...
Q1. Can I have multiple conditions in a single if statement? A1. Yes, you can combine multiple conditions using logical operators such as && (AND) and || (OR) to create compound conditions within a single if statement. Q2. Can I use the if statement to check the existence of a file...
问如何在bash中使用if语句仅捕获数组中的数字EN版权声明：本文为耕耘实录原创文章，各大自媒体平台同步更新...
in an if statement, part of a command executed in a && or || list except the command following the final && or ||, any command in a pipeline but the last, or if the command's return value is being inverted using !. These are the same conditions obeyed by the errexit (-e) option...
The uses of the “-z” and “-n” option to test the string values using the “if” statement in Bash are shown in this tutorial. Using the “If -Z” Statement Sometimes, it is required to check if a string variable is empty or if it contains a string of zero length. There are...
Checking the exit status using an ‘if’ statement in Bash Using a “if” statement and the “$?” variable, we can determine whether a command or script has executed successfully. Which holds the exit status of the most recent command executed, the syntax of the “if” statement for dete...
The syntax of the if statement in Bash is: if first-test-commands; then consequent-commands; [elif more-test-commands; then more-consequents;] [else alternate-consequents;] fi Tests commands in the bash if statement, and bash elif clauses, are executed in order until one test succeed....