在单个 exec php 语句中执行两个 shell 命令
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execute two shell commands in single exec php statement
提问by Warrior
I want to display all the files that are modified after a specified date
我想显示指定日期后修改的所有文件
the commands are
命令是
touch --date '2011-09-19 /home/ , find /home/
How i can execute this two commands in single exec statement.Thanks in advance
我如何在单个 exec 语句中执行这两个命令。提前致谢
回答by Marc B
You can use either a ;or a &&to separate the comands. The ;runs both commands unconditionally. If the first one fails, the second one still runs. Using &&makes the second command depend on the first. If the first command fails, the second will NOT run.
您可以使用 a;或 a&&来分隔命令。该;无条件地同时运行命令。如果第一个失败，第二个仍然运行。使用&&使第二个命令依赖于第一个。如果第一个命令失败，第二个将不会运行。
command1 ; command2 (run both uncondtionally)
command1 && command2 (run command2 only if command1 succeeds)
回答by PoorBoy
This is how I did it simultaneously encode thumbs, and then flv video..I need to generate 2 thumbs from avi file. After the thumbs I need to convert the same avi to flv or whatever. So, here is the code I normally used.
这就是我如何同时编码拇指，然后是 flv 视频..我需要从 avi 文件生成 2 个拇指。在拇指之后，我需要将相同的 avi 转换为 flv 或其他格式。所以，这是我通常使用的代码。
$command_one = "do whatever the script does best";
$command_two = "do whatever the script does second best";
//execute and redirect standard stream ..
@exec($command_one."&& ".$command_two.">/dev/null 1>/dev/null 2>/dev/null &");
You can also run array of commands with exec, if you want :)
如果需要，您还可以使用 exec 运行命令数组 :)
foreach($crapatoids as $crap){
$command_name = $crap;
//exec the crap below
@exec ($command_name." >/dev/null 1>/dev/null 2>/dev/null &");
}
回答by Rijk
Seperate them with a semicolon (;). Example:
用分号 (;) 分隔它们。例子：
exec("touch --date '2011-09-19' /home/; find /home/");
回答by JJ.
The semicolon separator allows you to run multiple commands on one line.
分号分隔符允许您在一行上运行多个命令。
<?php
$output = shell_exec("touch --date '2011-09-19' /home/; find /home/");
echo "<pre>" . $output . "</pre>";
?>
回答by Nguyen Tan Dat
Actually, my problem came from execution python file in a virtual environment of Python. Generally, Python website instructs us to go through command lines: create a virtual env --> activate it --> call Python file (e.g: python3 yourPyFile.py). However, when I was trying to adapt these steps through calling in php with exec()method, it didn't work. Finally, I found out you don't need to activate env at all, what you only need to use a python which already generated when you creating virtual env by path/to/virtual/env/bin/python3 yourPyFile.py.
实际上，我的问题来自在 Python 的虚拟环境中执行 python 文件。通常，Python 网站指示我们通过命令行：创建虚拟环境 --> 激活它 --> 调用 Python 文件（例如：）python3 yourPyFile.py。但是，当我尝试通过使用exec()方法调用 php 来调整这些步骤时，它不起作用。最后，我发现您根本不需要激活 env，您只需要使用在创建虚拟 env 时已经生成的 python 即可path/to/virtual/env/bin/python3 yourPyFile.py。
