ssh执行外部脚本时tee功能失效问题求助

Hey there! Let's figure out why your SSH session logs in libs/debug-monitor-logs are coming up empty, even though you want to record all actions and keep seeing output in your terminal. Here are the most common culprits and how to fix them:

1. Verify Log File Path & Permissions #

• First, double-check the path: If you're using a relative path (libs/debug-monitor-logs), make sure you're in the correct directory when starting your recording tool. Run pwd to confirm your current working directory, then ls -la libs/ to check if the folder and log file exist.
• Permissions matter: If the log file doesn't exist, try creating it manually with touch libs/debug-monitor-logs—if this fails, you don't have write access to the libs/ directory. If the file does exist, run ls -l libs/debug-monitor-logs to check your user has write permissions (look for the w in the user column). Fix this with chmod u+w libs/debug-monitor-logs to grant yourself write access.

2. Check Your Session Recording Tool Configuration #

• If you're using the standard script command (the go-to for recording terminal sessions), make sure you're using the right flags. The correct command to both show output in the terminal and write to your log file in real-time is:

  script -f libs/debug-monitor-logs
  

  The -f flag forces the tool to flush output to the log file immediately, instead of buffering it until the session ends. Without -f, your log file will stay empty until you exit the script session.
• If you're using a tool like ttyrec, confirm it's configured to output directly to libs/debug-monitor-logs—check its documentation for the correct output file parameter.

3. Fix Output Redirection Issues #

• If you tried manually redirecting SSH output (e.g., ssh user@host > libs/debug-monitor-logs), this only captures standard output, hides terminal display, and misses standard error. To keep terminal output and log everything, use tee:

  ssh user@host | tee -a libs/debug-monitor-logs
  

  The -a flag appends to the log instead of overwriting it. Note: This only captures remote command output, not your local input—use script if you need to record both input and output.

4. Check for Processes Interfering with the Log #

• Is another script or cron job clearing your log file? Open a second terminal and run tail -f libs/debug-monitor-logs to watch the file in real-time. Then perform an action in your SSH session—if nothing shows up in tail, the issue is that output isn't being written at all. If content appears then disappears, something is overwriting/clearing the file.

5. Ensure Terminal Type Compatibility #

• Some SSH terminal configurations can break recording tools. Try setting your terminal type explicitly before starting the recorder:

  export TERM=xterm
  script -f libs/debug-monitor-logs
  

  This fixes compatibility issues with non-standard terminal emulators.

Start with the first two checks—path/permissions and script flags—since those are the most common fixes. If those don't work, move through the rest one by one.

内容的提问来源于stack exchange，提问作者paolo9785