解析DIFF的结果Shell脚本 [英] Parsing result of Diff in Shell Script

问题描述

我要比较两个文件，​​看看他们都在我的shell脚本相同与否，我的办法是：

I want to compare two files and see if they are the same or not in my shell script, my way is:

diff_output=`diff ${dest_file} ${source_file}`

if [ some_other_condition -o ${diff_output} -o some_other_condition2 ]
then
....
fi

基本上，如果它们是相同的$ {} diff_output应该包含什么和上面的测试将评估为true。

Basically, if they are the same ${diff_output} should contain nothing and the above test would evaluate to true.

但是当我运行我的脚本，它说结果
[：参数太多

But when I run my script, it says
[: too many arguments

在如果[...]行。

任何想法？

推荐答案

你关心什么实际的区别，或者只是文件是否不同？如果是后者不需要解析输出;您可以检查出口code来代替。

Do you care about what the actual differences are, or just whether the files are different? If it's the latter you don't need to parse the output; you can check the exit code instead.

if diff -q "$source_file" "$dest_file" > /dev/null; then
    : # files are the same
else
    : # files are different
fi

或者使用 CMP 这是更有效的：

if cmp -s "$source_file" "$dest_file"; then
    : # files are the same
else
    : # files are different
fi

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