Question

我编写了一个shell脚本，用于在文本文件（称为test.txt）上运行。此脚本将读取输入文件，迭代其行，并执行一些操作。

我首先编译我的程序：

chmod +x ./cleanLines.txt

然后运行我的命令：

./cleanLines.txt < ./test.txt > output.txt

然而，我得到的错误是：

./cleanLines.txt: line 7: [[: command not found
./cleanLines.txt: line 7: [[#Some: command not found
./cleanLines.txt: line 7: [[HelloWorld: command not found
./cleanLines.txt: line 7: [[Today: command not found
./cleanLines.txt: line 7: [[Cookie: command not found
./cleanLines.txt: line 7: [[: command not found
./cleanLines.txt: line 7: [[Out: command not found
./cleanLines.txt: line 7: [[: command not found
./cleanLines.txt: line 7: [[: command not found

我的test.txt文件如下：

*blank line*(Won't let me edit it like this here)
#Some note
HelloWorld #note
Today is sunny
Cookie Monster

Out of things to say

和cleanLines.txt如下：

#!/bin/bash

    PATH=${PATH[*]}:.
    #filename: clearLines

    while read line; do
        if [[$line != ""]]; then
                .
                .
                # Doing stuff
                .
                .
        fi
    done < test.txt

注意：第7行是：

if [[$line != ""]]; then

这是什么问题？除非我必须（因为我们被严格告知不要），我不想发布我的其余代码。

Answer 1

空间很重要。替换：

if [[$line != ""]]; then

使用：

if [[ $line != "" ]]; then

实施例

注意这些失败：

$ line=1 ; [[$line != "" ]] && echo yes
bash: [[1: command not found
$ line=1 ; [[ $line != ""]] && echo yes
bash: conditional binary operator expected
bash: syntax error near `yes'

但是这个版本的间距正确，成功了：

$ line=1 ; [[ $line != "" ]] && echo yes
yes

重定向输入时命令未找到错误

1 个答案:

实施例