Unix / Linux Shell - if...elif...fi 语句 简述 if...elif...fi 语句是控制语句的一级高级形式,它允许壳牌从几个条件中做出正确的决定。 句法 if [ expression 1 ] then Statement(s) to be executed if expression 1 is true elif [ expression 2 ] then Statement(s) to be executed if ...
The if statement has the following syntax: 这个if 语句语法如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 if commands; then commands [elif commands; then commands...] [else commands] fi where commands is a list of commands. This is a little confusing at first glance. Butbefore we...
/bin/bash# test-string: evaluate the value of a stringANSWER=maybeif[ -z"$ANSWER"];thenecho"There is no answer.">&2exit1fiif["$ANSWER"="yes"];thenecho"The answer is YES."elif["$ANSWER"="no"];thenecho"The answer is NO."elif["$ANSWER"="maybe"];thenecho"The answer is MAYBE....
syntax error near unexpected token fi 等都是这样引起的. 5 if 后面一定要跟上 then. 同理 elif 后面一定要跟上 then. 不然提示出错信息: syntax error near unexpected token else top BASH IF http://lhsblog01.blog.163.com/blog/static/10200451920081118105937818/ Linux SHELL if 命令参数说明 2007年10...
To write multiple if conditions in a shell script, you can use elif statements. Here’s the syntax: if[condition1];then# code to execute if condition1 is trueelif[condition2];then# code to execute if condition1 is false and condition2 is trueelse# code to execute if all conditions are...
amount=2500print('Amount = ',amount)ifamount>10000:discount=amount*20/100elifamount>5000:discount=amount*10/100elifamount>1000:discount=amount*5/100else:discount=0print('Payable amount = ',amount-discount) The output of the above code is as follows − ...
UNIXAWK脚本-内存耗尽 、、、 +,ABC/) print "P," $0;elseEND { }P,123456,ABC,A,脚本添加更多的IF条件(大约3500)时,它抛出了一个‘内存耗尽’错误:awk2'|awk' 浏览0提问于2018-02-05得票数 1 1回答 如果其他条件为数组的awkfor循环 、、、 我...
if COMMAND then EXPRESSIONS elif COMMAND then EXPRESSIONS else EXPRESSIONS fi This structure is far from a single line. Moreover, we can have many lines inEXPRESSIONS. On top of that, we can expandCOMMANDwith the()syntax, adding still more lines. Finally, there are the&∧||operators, enabli...
Syntaxif conditional [then] code... [elsif conditional [then] code...]... [else code...] end if expressions are used for conditional execution. The values false and nil are false, and everything else are true. Notice Ruby uses elsif, not else if nor elif....
管道是类 UNIX 操作系统中非常强大的工具。通过管道,我们可以将实现各类小功能的程序拼接起来干大事。 示例如下: $ ls / | grep bin # 筛选 ls / 输出中所有包含 bin 字符串的行 bin sbin 1. 2. 3. 网络下载 为何使用 wget 和 cURL 在Windows 下,很多人下载文件时会使用「迅雷」、「QQ 旋风」(停止运...