Invalid method cp -f in Linux CentOS

The default cp command on Linux is aliased (alias cp=’cp -i’) and cannot be overwritten on copy, even if you use -f

To view

alias cp
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According to

alias cp='cp -i'
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The solution

1. Modify cp instruction

alias cp='cp'
cp -rf /test/a
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2. Cancel cp alias (rest assured this is not permanent) :

unalias cp
cp -rf /test/a

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3. Run the cp command without alias: (Note: recommend this method!)

\cp -rf /test/a
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4. Another interesting method:

yes|cp -rf /test/a
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