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Output redirect

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Write output to file ​

shell
## Any command is valid, not only echo
echo 'Hello World' > new_file
echo 'Hello World' >> append_existing_file

## Check if content exist before inserting
CONTENT='Hello World'; FILE=~/.bashrc
grep -qF -- "${CONTENT}" "${FILE}" || echo "${CONTENT}" >> "${FILE}"

Redirect stderr to stdout ​

shell
command > new_file 2>&1