PHP exec / diff /沒有這樣的文件

Question

我正在使用diff和sort來查找2個文件之間的差異。 在Linux提示符下，以下代碼可完美工作：

diff <(sort /real/path/yesterday.txt) <(sort /real/path/today.txt) > diff-today.txt

但是我無法使用exec（）從PHP運行相同的命令：

exec("diff <\(sort /real/path/yesterday.txt\) <\(sort /real/path/today.txt\) > diff-today.txt");

我收到以下錯誤：

sh: (sort: No such file or directory

有任何想法嗎？

Answer 1

將大命令拆分為小命令。 將文件一一排序，然后進行比較。 這段代碼對我有用。

echo exec('sort /real/path/yesterday.txt > /real/path/yesterday_sorted.txt ; sort /real/path/today.txt > /real/path/today_sorted.txt ; diff /real/path/yesterday_sorted.txt /real/path/today_sorted.txt > diff-today.txt');