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how to write string to file in bash

https://stackoverflow.com/questions/22713667/shell-script-how-to-write-a-string-to-file-and-to-stdout-on-console

echo

https://linux.die.net/man/1/echo

$ touch readme.md

# 追加 >>
$ echo "hello world" >> readme.md

# 覆盖 >
$ echo "hello world" > readme.md

tee

https://linux.die.net/man/1/tee

# tee
$ echo "hello  world" | tee readme.md

$ tee readme.md <<< "hello world"

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