PHP exec/diff/No such file

Question

我使用差异和排序来找出2个文件之间的差异。从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 

但我没能得到同样的命令，使用EXEC（）从PHP运行：

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

我收到以下错误：

sh: (sort: No such file or directory 

有没有想法？

Answer 1

将大命令分解为小命令。将文件逐个排序，然后执行差异。此代码为我工作。

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');