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显示文件差异的脚本

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显示文件差异的脚本

我试图找到我的两个文件的差异，但无法让它产生任何东西。这是我所做的

#Compare files and redirect output
ACTUAL_DIFF=`diff file.current file.previous 2>/dev/null`
if [ $? -ne 0 ]
    then
        echo "Comparing /tmp/file.current state (<) to /tmp/file.previous state (>), difference is: "
        echo ""
        echo $ACTUAL_DIFF | cut -f2,3 -d" "
        echo ""
    else
        echo "The current file state is identical to the previous run (on `ls -l file.previous | cut -f6,7,8 -d" "`) OR this is the initial run!"
        echo ""
    cat /tmp/file.diff
        echo ""
fi

答案1

您需要将变量放在引号中，否则换行符将被视为单词分隔符，并且所有输出都将在一行上：

echo "$ACTUAL_DIFF" | cut -f2,3 -d" "

另一种方法是不使用变量，直接通过管道传递diff到cut：

diff file.current file.previous 2>/dev/null | cut -f2,3 -d" "

您可以cmp在开始时使用更简单的命令来测试文件是否不同。

要将输出放入文件中并显示它，请使用该tee命令。

#Compare files and redirect output
ACTUAL_DIFF=`diff file.current file.previous 2>/dev/null`
if ! cmp -s file.current file.previous 2>/dev/null
then
    echo "Comparing /tmp/file.current state (<) to /tmp/file.previous state (>), difference is: "
    echo ""
    diff file.current file.previous 2>/dev/null | cut -f2,3 -d" " | tee /tmp/file.diff
    echo ""
else
    echo "The current file state is identical to the previous run (on `ls -l file.previous | cut -f6,7,8 -d" "`) OR this is the initial run!"
    echo ""
    cat /tmp/file.diff
    echo ""
fi

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