How to Resolve \" not found\" Error in Paramiko for Unix Command Execution?

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Running Unix Commands with " not found" Error in Paramiko

Python's Paramiko library may encounter difficulties when attempting to execute certain Unix commands using exec_command. Specifically, the error "sh: : not found" may arise. While simple commands like "ls" may execute successfully, special commands such as "sesu" fail.

Root Cause

The exec_command function in Paramiko by default does not run the shell in "login" mode or allocate a pseudo-terminal. This results in a different set of startup scripts being sourced than in regular SSH interactive sessions.

Solutions

Several solutions can address this issue:

• Use a full path: Specify the entire path to the command, e.g., "/bin/sesu test".
• Set the PATH environment variable: Ensure that the system PATH includes the directory containing the executable.
• Run the command via a login shell: Use the "--login" switch, e.g., "bash --login -c "sesu test"".
• Modify the command's environment: Set specific environment variables within the command itself, using syntax like "PATH=""$PATH;/path/to/sesu"" && sesu test".
• Force pseudo-terminal allocation: Use the "get_pty" parameter in exec_command, but be aware of potential side effects.

Additional Considerations

• Issues may also arise with environment variables like LD_LIBRARY_PATH and shared object locations.
• Refer to the linked resources for further insights and alternative approaches.

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