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Linux Shell Scripting Cheat Sheet/Append stdout to file

Append output to an existing file.

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Section: Input Output and Pipelines

Append stdout to file

bash
bash
echo 'next line' >> app.log
Explanation

Common for quick logging in scripts.

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Redirect stdout to file
Write output to a file, overwriting it.
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Redirect stderr to file
Send errors to a separate file.
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Redirect stdout and stderr together
Capture all output in one file.
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Pipe stdout to another command
Send output of one command as input to another.
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Use process substitution
Pass command output as a pseudo-file.
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Prompt user for input
Read a value interactively.
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