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I'm working on a php script, where I want to delete some files from a given folder using wildcard (*).
I've found some working examples like this one, where unlink() and glob() function are used.
Now, i was wondering, would it also be ok to delete the files using the exec function and a command like rm -f /path/to/folder/_prefix_* ?
Are there any security risks taken using this?
And if it is ok, would it be better in terms of performance?
EDIT:
So, from the first answers i can see that indeed, using exec could be an acceptable solution.
What about performance issues? Is there any chance the exec option could be better (faster/less demanding) over the glob/unlink technique?
Thank you in advance
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To delete multiple files at once, simply list all of the file names after the “rm” command. File names should be separated by a space. With the command “rm” followed by multiple file names, you can delete multiple files at once.
To delete multiple files at once, use the rm command followed by the file names separated by space.
The rm command in Linux removes files and directories. Note: To remove multiple files or directories using the rm command, add multiple file or directory names, separated by blank spaces. The different rm command options include: - f : Forces the removal of all files or directories.
Because there is no chance for user-supplied data to be injected, there is no security issue in using exec over glob/unlink. However, using glob/unlink allows you to define exceptions:
foreach(glob("delete/*") as $f) {
if( $f == "delete/notme.txt") continue;
unlink($f);
}
And exec is often disabled on shared servers so glob/unlink is more portable. If you have a dedicated setup and don't intend on giving it up, you don't need to worry about that.
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