How does RUN write line break code in dockerfile

  docker, question

For example, you want to perform this

tee /root/.pip/pip.conf <<-'EOF'
 [global]
 index-url =  https://pypi.douban.com/simple/
 EOF

How to write in dockerfile, direct writing is not acceptable. If it is written in the following form, it will become a single line and cannot meet the original format requirements

RUN tee /root/.pip/pip.conf <<-'EOF' \
 [global] \
 index-url =  https://pypi.douban.com/simple/ \
 EOF

Please advise

Use line breaks\n

echo "[global]\nindex-url =  https://pypi.douban.com/simple/\n" > /root/.pip/pip.conf

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