Linux Pipes and Redirects
Chain commands and capture output like a shell native.
- linux pipe
- redirect stderr
- tee
- pipefail
- stdout stdin
Linux Pipes and Redirects
Chain commands and capture output like a shell native.
Commands
| Command | What it does |
|---|---|
stdout plus stderr to file | Merge streams with 2-and-1 |
append redirect | Append instead of overwrite |
pipe commands | Feed stdout into the next command |
tee save and show | See output AND save it |
feed file as stdin | Redirect a file into a command |
Example
./deploy.sh 2>&1 | tee deploy.log
grep ERROR deploy.log | headFAQ
Does redirect order matter?
Yes - the stream merge must come last, or stderr goes to the old terminal.
Do pipelines hide failures?
Pipelines return the last command's code - set pipefail in scripts to catch mid-pipe failures.
常见问题
Does redirect order matter?
Yes - the stream merge must come last, or stderr goes to the old terminal.
Do pipelines hide failures?
Pipelines return the last command's code - set pipefail in scripts to catch mid-pipe failures.
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