If-statement-Bash-Script-Example if-else Statement 除了普通的 if 语句之外,我们还可以用 else 块扩展 if 语句。基本思想是,如果语句为真,则执行 if 块。如果语句为假,则执行 else 块。 Syntax : if [ condition_command ] then command1 command2 …….. last_command else command1 command2 …….. ...
如果 condition1 成立，那么就执行 if 后边的 statement1；如果 condition1 不成立，那么继续执行 elif，...
if 语句通过关系运算符判断表达式的真假来决定执行哪个分支。 Shell 有三种 if ... else 语句: if ... fi 语句; if ... else ... fi 语句; if ... elif ... else ... fi 语句。 语法格式: if [ expression ] then Statement(s) to be executed if expression is true fi ## 注意, expressio...
Your shell script uses an "if" statement to see if the word "yes" was entered. This "if" statement looks like:A、if ( RESPONSE = "yes" ) ; thenB、if [ RESPONSE = "yes" ) ; thenC、if [ RESPONSE == "yes" ] ; thenD、if ( RESPONSE = "yes" ) ; then...
#提前准备好用户的文件[root@VM_0_10_centos shellScript]#vi username.txttest01 test02 test03 test04 test05 test06#vi example.sh#!/bin/bashread -p"请输入用户密码:"PASSWDforUNAMEin`cat username.txt`doid$UNAME&> /dev/nullif[ $?-eq0] ...
在C Shell脚本中,if语句用于根据条件执行不同的代码块。if语句的语法如下: 代码语言:txt 复制 if (表达式) then # 执行语句块1 else if (表达式) then # 执行语句块2 else # 执行语句块3 endif 其中,表达式可以是任何返回布尔值的条件表达式。根据表达式的结果,if语句将执行相应的语句块。如果表达式为真,则...
if[-e/home/oicq/script/get_random_shm_key.sh] 判断文件大小是否为空 代码语言:javascript 代码运行次数:0 运行 AI代码解释 if[!-s ${REMOTE_FILE}]then SH_error_msg"${REMOTE_FILE} file is empty"return1fi 循环 For for循环的一般格式为: ...
You can also use theifstatement scriptblock to assign a value to a variable. PowerShell $discount=if($age-ge55) {Get-SeniorDiscount}elseif($age-le13) {Get-ChildDiscount}else{0.00} Each script block is writing the results of the commands, or the value, as output. We can assign the ...
In this example, the script first checks if ‘a’ is greater than ‘b’. If it’s not, it moves on to the ‘elif’ statement to check if ‘a’ is greater than ‘c’. If neither condition is met, it executes the ‘else’ statement, which in this case, prints ‘a is not greate...
8 shell if elif else 2019-12-19 18:59 −if 语句的判断条件,从本质上讲,判断的就是命令的退出状态。 语句语句格式同一行书写注意点用例1用例2 if 语句 if conditionthen statement(s)fi if condition; then statement(s)... 声声慢43 0 589 ...