PHP exec/diff/No such file

Question

我使用差異和排序來找出2個文件之間的差異。從Linux提示符下面的工作完美：

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

但我沒能得到同樣的命令，使用EXEC（）從PHP運行：

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 

有沒有想法？

Answer 1

將大命令分解爲小命令。將文件逐個排序，然後執行差異。此代碼爲我工作。

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');