Question

有人可以帮助我理解为什么第一个条件总是被执行，好像条件总是真的，但显然不是吗？

#!/bin/bash

echo "starting..."


got_file="false"
got_sleep_time="false"
file="None"
sleeptime=0

for i in $@;
do
        if [ $got_file==false ]; then
                file="$i"
                echo "file is $file, got_file is $got_file, setting it to true."
                got_file=true
        elif [ $got_sleep_time==false ]; then
                sleep_time="$i"
                got_sleep_time=true
        else
                echo "-WE MADE IT-"
                echo "The number is $i"
                echo date
                sleep $sleep_time
                echo "--- moving on---"
        fi
done
echo "from the cli we get file=$file, sleeptime=$sleeptime s"
echo "done!"

当我像这样运行时

$ ./mybashscript somefilename.txt 10 42 53 14

我明白了

starting...
file is somefilename.txt, got_file is false, setting it to true.
file is 10, got_file is true, setting it to true.
file is 42, got_file is true, setting it to true.
file is 53, got_file is true, setting it to true.
file is 14, got_file is true, setting it to true.
from the cli we get file=14, sleeptime=0
done!

我希望输出看起来像这样

file is somefilename.txt, got_file is false, setting it to true.
-WE MADE IT-
The number is 42
Mon Apr 16 21:44:21 UTC 2018
-WE MADE IT-
The number is 53
Mon Apr 16 21:44:31 UTC 2018
-WE MADE IT-
The number is 14
Mon Apr 16 21:44:41 UTC 2018
from the cli we get file=somefilename.txt, sleeptime=10 s

我尝试使用[[EXPRESSION]]的每个组合以及使用单个＆＃39; =＆＃39;而不是doube＆＃39; ==＆＃39;引号如＆＃34; $ got_file＆＃34; =＆＃34; false＆＃34;或者其他结果总是相同的，第一个if语句总是被执行。

使用if elif和else语句在bash中循环使用cli参数

0 个答案: