Running Bash Commands in Python
You may encounter errors when running Bash commands within a Python script on a server, even though the same code works locally. One common reason for this is the different ways Bash is invoked by the operating system.
Understanding Bash
In Python, you can run Bash commands using the subprocess module. However, the default behavior is to use /bin/sh, which is a minimal shell that doesn't support all of Bash's features. If you need Bash-specific syntax, you must explicitly specify the Bash executable as:
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Shell vs. No Shell
You can invoke subprocess.run() with shell=True or shell=False. With shell=True, you provide a single string command that the shell parses. With shell=False, you pass a list of string arguments to the executable without using a shell.
Using shell=False avoids shell features but requires precise parsing of the command into arguments. The shlex.split() function can assist with this.
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Text Decoding
By default, subprocess output is provided as bytes. To decode it into a Unicode string, use text=True.
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Troubleshooting
If you still encounter errors, it's important to check:
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