Specific Use of 'shell=True' in Subprocess
When utilizing the subprocess module, the 'shell=True' argument serves a specific purpose. While both the following code snippets execute the same process, they differ in their approach:
callProcess = subprocess.Popen(['ls', '-l'], shell=True) callProcess = subprocess.Popen(['ls', '-l']) # without shell
When to Use 'shell=True'
Invoking 'shell=True' implies that the command will be executed through a shell interpreter, allowing for the expansion of environment variables and file globs. However, this approach carries potential risks:
Preferred Approach
Generally, it is advisable to avoid using 'shell=True'. Here are some reasons:
Summary
Unless you have a specific need for shell expansion, it is recommended to set 'shell=False' for subprocess invocations. This ensures that the process is executed directly without relying on an interpreter or introducing unnecessary risks.
The above is the detailed content of When Should I Use `shell=True` with the `subprocess` Module?. For more information, please follow other related articles on the PHP Chinese website!