php shell exec与直接运行命令不同

时间:2012-12-24 12:22:53

标签: php bash svn

我有一个php脚本试图从目录结构中删除所有文件,但保留svn中的所有内容。我在网上找到了这个命令,如果你把它直接插在一个shell中,它可以完美地完成工作

find /my/folder/path/ -path \'*/.svn\' -prune -o -type f -exec rm {} +

不幸的是,如果我在php上执行一个shell_exec就像这样:

$cmd = 'find $folderPath -path \'*/.svn\' -prune -o -type f -exec rm {} +';
shell_exec($cmd);

然后我当前目录中所有调用php脚本的文件也会被删除。

有人可以解释原因,以及如何解决问题,以便我可以修复php脚本,使其按预期运行,只删除指定文件夹中的那些文件

完整的源代码如下,以防万一我可能错过了一个愚蠢的错误:

<?php

# This script simply removes all files from a specified folder, that aren't directories or .svn 
# files. It will see if a folder path was given as a cli parameter, and if not, ask the user if they 
# want to remove the files in their current directory.

$execute = false;

if (isset($argv[1]))
{
    $folderPath = $argv[1];
    $execute = true;
}
else
{
    $folderPath = getcwd();
    $answer = readline("Remove all files but not folders or svn files in $folderPath (y/n)?" . PHP_EOL);

    if ($answer == 'Y' || $answer == 'y')
    {
        $execute = true;
    }
}

if ($execute)
{
    # Strip out the last / if it was given by accident as this can cause deletion of wrong files
    if (substr($folderPath, -1) != '/')
    {
        $folderPath .= "/";
    }

    print "Removing files from $folderPath" . PHP_EOL;
    $cmd = 'find $folderPath -path \'*/.svn\' -prune -o -type f -exec rm {} +';
    shell_exec($cmd);
}
else
{
    print "Ok not bothering." . PHP_EOL;
}

print "Done" . PHP_EOL;

?>

2 个答案:

答案 0 :(得分:2)

你的命令看起来没问题。至少在shell中。如果您真的使用简单的

解决PHP中的问题
var_dump($cmd);

您会看到错误所在:

$cmd = 'find $folderPath -path \'*/.svn\' -prune -o -type f -exec rm {} +';

仔细观察。提示:A single can't make a double for a dollar

答案 1 :(得分:1)

这一切都归结为:

$cmd = 'find $folderPath -path \'*/.svn\' -prune -o -type f -exec rm {} +';
shell_exec($cmd);

由于您使用的是单引号,因此不会更改变量$folderPath。所以你正在执行

find $folderPath -path '*/.svn' -prune -o -type f -exec rm {} +

而不是

find /my/folder/path/ -path \'*/.svn\' -prune -o -type f -exec rm {} +

使用双引号或$cmd = 'find '.$folderPath.' -path \'*/.svn\' -prune -o -type f -exec rm {} +';