在执行Shell脚本中的另一个命令之前提示确认的命令

Question

我使用以下命令打开、替换、查看更改并保存文件：

sed 's/old string/new string/g' filename > filename1; diff filename1 filename; mv filename1 filename

是否可以在执行mv命令之前请求确认，如下所示？

sed 's/old string/new string/g' filename > filename1
diff filename1 filename
<Some-Command here for user to provide Yes or NO confirmation>
mv filename1 filename

目的是验证更改，然后再保存。

Answer 1

我在bash:上使用这个简单的一行

CCD_ 2。

这样，我就不依赖于另一个实用程序，它只会在输入为单个y时运行。

Answer 2

是的，您可以通过read将用户输入读取到变量中，然后与一些可接受的值进行比较，如"yes"。您还可以将命令存储在变量中，并将其打印给用户，然后再执行。

#!/bin/bash
COMMAND='mv filename1 filename'
echo "Perform the following command:"
echo
echo "    $ $COMMAND"
echo
echo -n "Answer 'yes' or 'no': "
read REPLY
if [[ $REPLY == "yes" ]]; then
    $COMMAND
else
    echo Aborted
    exit 0
fi

Answer 3

我的脚本是

#!/bin/bash

sed 's/This/It/g' test.xml > "test.xml1"
diff test.xml test.xml1
COMMAND ='mv test.xml1 test.xml'
echo "Perform the following command:"
echo
echo "   $ $COMMAND"
echo
echo -n "Answer 'yes' or 'no':"
read REPLY 
if[[$REPLY=="yes"]]; then
$COMMAND
else 
echo Aborted
exit 0
fi  

执行时的错误是，

2c2
< This is a Test file
---
> It is a Test file
./test.sh[9]: COMMAND:  not found
Perform the following command:
   $
-n Answer 'yes' or 'no':
yes
./test.sh[19]: syntax error at line 20 : `then' unexpected

mv命令不起作用。